js获取本周、本月、本季度、本年开始，结束时间

发布时间：2023-04-07, 14:30:27 分类：HTML | 编辑 off 网址 | 辅助

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function HXtimeSlotChange(val) {
    let startTime, endTime;
    let now = new Date(); //当前日期
    var nowDayOfWeek = now.getDay(); //今天本周的第几天
    var nowDay = now.getDate(); //当前日
    let nowMonth = now.getMonth(); //当前月
    let nowYear = now.getFullYear(); //当前年
    let jd=Math.ceil((nowMonth + 1) / 3);
    switch (val) {
        case "本周":
            startTime = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
            endTime = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))
        case "本月":
            startTime = new Date(nowYear, nowMonth, 1)
            endTime = new Date(nowYear, nowMonth + 1, 0)
            break;
        case "本季度":
            startTime = new Date(nowYear, (jd-1)*3, 1)
            endTime = new Date(nowYear, jd*3, 0)
            break
        case "本年":
            startTime = new Date(nowYear, 0, 1)
            endTime = new Date(nowYear, nowMonth, nowDay)
            break
    }
    //格式化日期：yyyy-MM-dd
    function formatDate(date) {
        var myyear = date.getFullYear();
        var mymonth = date.getMonth() + 1;
        var myweekday = date.getDate();
        if (mymonth < 10) {
            mymonth = "0" + mymonth;
        }
        if (myweekday < 10) {
            myweekday = "0" + myweekday;
        }
        return (myyear + "-" + mymonth + "-" + myweekday);
    }
    console.log(formatDate(startTime),formatDate(endTime))
}

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标签: js139 获取59 本周1 本月1 本季度1 本年1 开始3 结束5 时间23

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广西南宁市 2023-04-07, 14:36:08

                pickerOptions: {
                    shortcuts: [
                    {
                        text: '今日',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        // start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);
                        picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '昨 天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 1);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 1);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '前 天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 2);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 2);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '大前天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 3);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 3);
                        picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '本周',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            let nowDayOfWeek = now.getDay(); //今天本周的第几天
                            let nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
                            const  end = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 1);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 1);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '上 周',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            let nowDayOfWeek = now.getDay(); //今天本周的第几天
                            let nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
                            const  end = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 1 - 3600 * 1000 * 24 * 7);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 1 - 3600 * 1000 * 24 * 7);
                            picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '本月',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, 1)
                            const  end = new Date(nowYear, nowMonth + 1, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '上个月',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth-1, 1)
                            const  end = new Date(nowYear, nowMonth, 1)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() -1 + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '上个季度',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年
                            let jd=Math.ceil((nowMonth + 1) / 3)-1;

                            const start = new Date(nowYear, (jd-1)*3, 1)
                            const  end = new Date(nowYear, jd*3, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '本季度',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年
                            let jd=Math.ceil((nowMonth + 1) / 3);

                            const start = new Date(nowYear, (jd-1)*3, 1)
                            const  end = new Date(nowYear, jd*3, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '最近一周',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);
                        picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '最近一个月',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 30);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '最近三个月',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 90);
                        picker.$emit('pick', [start, end]);
                        }
                    }],
                    disabledDate:(dd_date_time)=> {
                        return dd_date_time.getTime() > new Date().getTime();
                    }
                },

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reply | quote | #¹

广西河池市 2023-05-29, 16:16:19

PHP获得当日零点时间戳


header("Content-type:text/html;charset=utf-8");
//设置北京时间为默认时区
date_default_timezone_set('PRC');

//输出当前时间
echo date("Y-m-d H:i:s",time()); //2016-08-11 10:30:32

//获得当日凌晨的时间戳
$today = strtotime(date("Y-m-d"),time());
echo '<br>';
echo $today; //1470844800
echo '<br>';

//验证当日凌晨的时间戳是否正确
echo date("Y-m-d H:i:s",$today); //2016-08-11 00:00:00
echo '<br>';

//当天的24点时间戳
$end = $today+60*60*24;
//验证当天的24点时间戳是否正确
echo date("Y-m-d H:i:s", $end); //2016-08-12 00:00:00
echo '<br>';

//获得指定时间的零点的时间戳
$time = strtotime('2014-06-06');
echo '<br>';
echo $time; //1401984000
echo '<br>';
//验证是否是指定时间的时间戳
echo date("Y-m-d H:i:s",$time); //2014-06-06 00:00:00

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reply | quote | #²

广西河池市 2023-05-29, 16:16:50

PHP中文处理中文字符串截取(mb_substr)和获取中文字符串字数

一、中文截取：mb_substr()

mb_substr( $str, $start, $length, $encoding )

$str，需要截断的字符串
$start，截断开始处，起始处为0
$length，要截取的字数
$encoding，网页编码，如utf-8,GB2312,GBK

实例：
复制代码 代码如下:
<?php
$str='脚本之家：http://www.jb51.net';
echo mb_substr($str,0,4,'utf-8');//截取头5个字，假定此代码所在php文件的编码为utf-8
?>
结果显示：脚本之家


二、获取中文长度:mb_strlen()

mb_strlen( $str, $encoding )

$str，要计算长度的字符串
$encoding，网页编码，如utf-8,GB2312,GBK

实例：
复制代码 代码如下:
<?php
$str='脚本之家：http://www.jb51.net';
echo mb_strlen($str,'utf-8');//假定此代码所在php文件的编码为utf-8
?>
结果显示：24

学习时的痛苦是暂时的 未学到的痛苦是终生的

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reply | quote | #³

广西河池市 2023-05-29, 16:18:33

js Array vs []，以及是否为空的判断
两者基本相同，唯一不同点在于初始化：

var a = [],            // these are the same
b = new Array(),   // a and b are arrays with length 0

c = ['foo', 'bar'],           // these are the same
d = new Array('foo', 'bar'),  // c and d are arrays with 2 strings

// these are different:
e = [3]             // e.length == 1, e[0] == 3
f = new Array(3),   // f.length == 3, f[0] == undefined

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也就是说Array(arg)，其中的arg是指生成数组的长度。

参考：What’s the difference between “Array()” and “[]” while declaring a JavaScript array?

检查array是否为空：

if (array === undefined || array.length == 0) {
    // array empty or does not exist
}

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reply | quote | #⁴

广西河池市 2023-05-29, 16:21:51

JS判断是否是微信打开页面

function isWeiXin(){
    var ua = window.navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i) == 'micromessenger' || ua.match(/_SQ_/i) == '_sq_'){
        return true;
    }else{
        return false;
    }
}

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reply | quote | #⁵

广西河池市 2023-05-29, 16:30:52

php 将图片转成base64
PHP保存Base64图片base64_decode的问题
PHP对Base64的支持非常好，有内置的base64_encode与base64_decode负责图片的Base64编码与解码。
编码上，只要将图片流读取到，而后使用base64_encode进行进行编码即可得到。

/**
 * 获取图片的Base64编码(不支持url)
 * @date 2017-02-20 19:41:22
 *
 * @param $img_file 传入本地图片地址
 *
 * @return string
 */
function imgToBase64($img_file) {

    $img_base64 = '';
    if (file_exists($img_file)) {
        $app_img_file = $img_file; // 图片路径
        $img_info = getimagesize($app_img_file); // 取得图片的大小，类型等

        //echo '<pre>' . print_r($img_info, true) . '</pre><br>';
        $fp = fopen($app_img_file, "r"); // 图片是否可读权限

        if ($fp) {
            $filesize = filesize($app_img_file);
            $content = fread($fp, $filesize);
            $file_content = chunk_split(base64_encode($content)); // base64编码
            switch ($img_info[2]) {           //判读图片类型
                case 1: $img_type = "gif";
                    break;
                case 2: $img_type = "jpg";
                    break;
                case 3: $img_type = "png";
                    break;
            }

            $img_base64 = 'data:image/' . $img_type . ';base64,' . $file_content;//合成图片的base64编码

        }
        fclose($fp);
    }

    return $img_base64; //返回图片的base64
}


//调用使用的方法
$img_dir = dirname(__FILE__) . '/uploads/img/11213223.jpg';
$img_base64 = imgToBase64($img_dir);
echo '<img src="' . $img_base64 . '">';       //图片形式展示
echo '<hr>';
echo $img_base64;           //输出Base64编码

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而解码就略微麻烦一点，究其原因在于把图片编码成base64字符串后，编码内会加入这些字符 data:image/png;base64，本来是用于base64进行识别的。但是如果直接放到php里用base64_decode函数解码会导致最终保存的图片文件格式损坏，而解决方法就是先去掉这一串字符：

$base64_string= explode(',', $base64_string); //截取data:image/png;base64, 这个逗号后的字符
$data= base64_decode($base64_string[1]);　　//对截取后的字符使用base64_decode进行解码
file_put_contents($url, $data); //写入文件并保存

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reply | quote | #⁶

广西河池市 2023-05-31, 16:58:00

Js获取当前日期时间及其它操作
var myDate = new Date();
myDate.getYear();        //获取当前年份(2位)
myDate.getFullYear();    //获取完整的年份(4位,1970-????)
myDate.getMonth();       //获取当前月份(0-11,0代表1月)
myDate.getDate();        //获取当前日(1-31)
myDate.getDay();         //获取当前星期X(0-6,0代表星期天)
myDate.getTime();        //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours();       //获取当前小时数(0-23)
myDate.getMinutes();     //获取当前分钟数(0-59)
myDate.getSeconds();     //获取当前秒数(0-59)
myDate.getMilliseconds();    //获取当前毫秒数(0-999)
myDate.toLocaleDateString();     //获取当前日期
var mytime=myDate.toLocaleTimeString();     //获取当前时间
myDate.toLocaleString( );        //获取日期与时间

 

日期时间脚本库方法列表

Date.prototype.isLeapYear 判断闰年
Date.prototype.Format 日期格式化
Date.prototype.DateAdd 日期计算
Date.prototype.DateDiff 比较日期差
Date.prototype.toString 日期转字符串
Date.prototype.toArray 日期分割为数组
Date.prototype.DatePart 取日期的部分信息
Date.prototype.MaxDayOfDate 取日期所在月的最大天数
Date.prototype.WeekNumOfYear 判断日期所在年的第几周
StringToDate 字符串转日期型
IsValidDate 验证日期有效性
CheckDateTime 完整日期时间检查
daysBetween 日期天数差

js代码：

//---------------------------------------------------  
// 判断闰年  
//---------------------------------------------------  
Date.prototype.isLeapYear = function()   
{   
    return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0)));   
}   
  
//---------------------------------------------------  
// 日期格式化  
// 格式 YYYY/yyyy/YY/yy 表示年份  
// MM/M 月份  
// W/w 星期  
// dd/DD/d/D 日期  
// hh/HH/h/H 时间  
// mm/m 分钟  
// ss/SS/s/S 秒  
//---------------------------------------------------  
Date.prototype.Format = function(formatStr)   
{   
    var str = formatStr;   
    var Week = ['日','一','二','三','四','五','六'];  
  
    str=str.replace(/yyyy|YYYY/,this.getFullYear());   
    str=str.replace(/yy|YY/,(this.getYear() % 100)>9?(this.getYear() % 100).toString():'0' + (this.getYear() % 100));   
  
    str=str.replace(/MM/,this.getMonth()>9?this.getMonth().toString():'0' + this.getMonth());   
    str=str.replace(/M/g,this.getMonth());   
  
    str=str.replace(/w|W/g,Week[this.getDay()]);   
  
    str=str.replace(/dd|DD/,this.getDate()>9?this.getDate().toString():'0' + this.getDate());   
    str=str.replace(/d|D/g,this.getDate());   
  
    str=str.replace(/hh|HH/,this.getHours()>9?this.getHours().toString():'0' + this.getHours());   
    str=str.replace(/h|H/g,this.getHours());   
    str=str.replace(/mm/,this.getMinutes()>9?this.getMinutes().toString():'0' + this.getMinutes());   
    str=str.replace(/m/g,this.getMinutes());   
  
    str=str.replace(/ss|SS/,this.getSeconds()>9?this.getSeconds().toString():'0' + this.getSeconds());   
    str=str.replace(/s|S/g,this.getSeconds());   
  
    return str;   
}   
  
//+---------------------------------------------------  
//| 求两个时间的天数差 日期格式为 YYYY-MM-dd   
//+---------------------------------------------------  
function daysBetween(DateOne,DateTwo)  
{   
    var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));  
    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);  
    var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));  
  
    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));  
    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);  
    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));  
  
    var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);   
    return Math.abs(cha);  
}  
  
  
//+---------------------------------------------------  
//| 日期计算  
//+---------------------------------------------------  
Date.prototype.DateAdd = function(strInterval, Number) {   
    var dtTmp = this;  
    switch (strInterval) {   
        case 's' :return new Date(Date.parse(dtTmp) + (1000 * Number));  
        case 'n' :return new Date(Date.parse(dtTmp) + (60000 * Number));  
        case 'h' :return new Date(Date.parse(dtTmp) + (3600000 * Number));  
        case 'd' :return new Date(Date.parse(dtTmp) + (86400000 * Number));  
        case 'w' :return new Date(Date.parse(dtTmp) + ((86400000 * 7) * Number));  
        case 'q' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number*3, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'm' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'y' :return new Date((dtTmp.getFullYear() + Number), dtTmp.getMonth(), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
    }  
}  
  
//+---------------------------------------------------  
//| 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串  
//+---------------------------------------------------  
Date.prototype.DateDiff = function(strInterval, dtEnd) {   
    var dtStart = this;  
    if (typeof dtEnd == 'string' )//如果是字符串转换为日期型  
    {   
        dtEnd = StringToDate(dtEnd);  
    }  
    switch (strInterval) {   
        case 's' :return parseInt((dtEnd - dtStart) / 1000);  
        case 'n' :return parseInt((dtEnd - dtStart) / 60000);  
        case 'h' :return parseInt((dtEnd - dtStart) / 3600000);  
        case 'd' :return parseInt((dtEnd - dtStart) / 86400000);  
        case 'w' :return parseInt((dtEnd - dtStart) / (86400000 * 7));  
        case 'm' :return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1);  
        case 'y' :return dtEnd.getFullYear() - dtStart.getFullYear();  
    }  
}  
  
//+---------------------------------------------------  
//| 日期输出字符串，重载了系统的toString方法  
//+---------------------------------------------------  
Date.prototype.toString = function(showWeek)  
{   
    var myDate= this;  
    var str = myDate.toLocaleDateString();  
    if (showWeek)  
    {   
        var Week = ['日','一','二','三','四','五','六'];  
        str += ' 星期' + Week[myDate.getDay()];  
    }  
    return str;  
}  
  
//+---------------------------------------------------  
//| 日期合法性验证  
//| 格式为：YYYY-MM-DD或YYYY/MM/DD  
//+---------------------------------------------------  
function IsValidDate(DateStr)   
{   
    var sDate=DateStr.replace(/(^\s+|\s+$)/g,''); //去两边空格;   
    if(sDate=='') return true;   
    //如果格式满足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替换为''   
    //数据库中，合法日期可以是:YYYY-MM/DD(2003-3/21),数据库会自动转换为YYYY-MM-DD格式   
    var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g,'');   
    if (s=='') //说明格式满足YYYY-MM-DD或YYYY-M-DD或YYYY-M-D或YYYY-MM-D   
    {   
        var t=new Date(sDate.replace(/\-/g,'/'));   
        var ar = sDate.split(/[-/:]/);   
        if(ar[0] != t.getYear() || ar[1] != t.getMonth()+1 || ar[2] != t.getDate())   
        {   
            //alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。');   
            return false;   
        }   
    }   
    else   
    {   
        //alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。');   
        return false;   
    }   
    return true;   
}   
  
//+---------------------------------------------------  
//| 日期时间检查  
//| 格式为：YYYY-MM-DD HH:MM:SS  
//+---------------------------------------------------  
function CheckDateTime(str)  
{   
    var reg = /^(\d+)-(\d{ 1,2 })-(\d{ 1,2 }) (\d{ 1,2 }):(\d{ 1,2 }):(\d{ 1,2 })$/;   
    var r = str.match(reg);   
    if(r==null)return false;   
    r[2]=r[2]-1;   
    var d= new Date(r[1],r[2],r[3],r[4],r[5],r[6]);   
    if(d.getFullYear()!=r[1])return false;   
    if(d.getMonth()!=r[2])return false;   
    if(d.getDate()!=r[3])return false;   
    if(d.getHours()!=r[4])return false;   
    if(d.getMinutes()!=r[5])return false;   
    if(d.getSeconds()!=r[6])return false;   
    return true;   
}   
  
//+---------------------------------------------------  
//| 把日期分割成数组  
//+---------------------------------------------------  
Date.prototype.toArray = function()  
{   
    var myDate = this;  
    var myArray = Array();  
    myArray[0] = myDate.getFullYear();  
    myArray[1] = myDate.getMonth();  
    myArray[2] = myDate.getDate();  
    myArray[3] = myDate.getHours();  
    myArray[4] = myDate.getMinutes();  
    myArray[5] = myDate.getSeconds();  
    return myArray;  
}  
  
//+---------------------------------------------------  
//| 取得日期数据信息  
//| 参数 interval 表示数据类型  
//| y 年 m月 d日 w星期 ww周 h时 n分 s秒  
//+---------------------------------------------------  
Date.prototype.DatePart = function(interval)  
{   
    var myDate = this;  
    var partStr='';  
    var Week = ['日','一','二','三','四','五','六'];  
    switch (interval)  
    {   
        case 'y' :partStr = myDate.getFullYear();break;  
        case 'm' :partStr = myDate.getMonth()+1;break;  
        case 'd' :partStr = myDate.getDate();break;  
        case 'w' :partStr = Week[myDate.getDay()];break;  
        case 'ww' :partStr = myDate.WeekNumOfYear();break;  
        case 'h' :partStr = myDate.getHours();break;  
        case 'n' :partStr = myDate.getMinutes();break;  
        case 's' :partStr = myDate.getSeconds();break;  
    }  
    return partStr;  
}  
  
//+---------------------------------------------------  
//| 取得当前日期所在月的最大天数  
//+---------------------------------------------------  
Date.prototype.MaxDayOfDate = function()  
{   
    var myDate = this;  
    var ary = myDate.toArray();  
    var date1 = (new Date(ary[0],ary[1]+1,1));  
    var date2 = date1.dateAdd(1,'m',1);  
    var result = dateDiff(date1.Format('yyyy-MM-dd'),date2.Format('yyyy-MM-dd'));  
    return result;  
}  
  
//+---------------------------------------------------  
//| 取得当前日期所在周是一年中的第几周  
//+---------------------------------------------------  
Date.prototype.WeekNumOfYear = function()  
{   
    var myDate = this;  
    var ary = myDate.toArray();  
    var year = ary[0];  
    var month = ary[1]+1;  
    var day = ary[2];  
    document.write('< script language=VBScript\> \n');  
    document.write('myDate = Datue(''+month+'-'+day+'-'+year+'') \n');  
    document.write('result = DatePart('ww', myDate) \n');  
    document.write(' \n');  
    return result;  
}  
  
//+---------------------------------------------------  
//| 字符串转成日期类型   
//| 格式 MM/dd/YYYY MM-dd-YYYY YYYY/MM/dd YYYY-MM-dd  
//+---------------------------------------------------  
function StringToDate(DateStr)  
{   
  
    var converted = Date.parse(DateStr);  
    var myDate = new Date(converted);  
    if (isNaN(myDate))  
    {   
        //var delimCahar = DateStr.indexOf('/')!=-1?'/':'-';  
        var arys= DateStr.split('-');  
        myDate = new Date(arys[0],--arys[1],arys[2]);  
    }  
    return myDate;  
}  

 

若要显示:当前日期加时间(如:2009-06-12 12:00)

function CurentTime()
    { 
        var now = new Date();
       
        var year = now.getFullYear();       //年
        var month = now.getMonth() + 1;     //月
        var day = now.getDate();            //日
       
        var hh = now.getHours();            //时
        var mm = now.getMinutes();          //分
       
        var clock = year + "-";
       
        if(month < 10)
            clock += "0";
       
        clock += month + "-";
       
        if(day < 10)
            clock += "0";
           
        clock += day + " ";
       
        if(hh < 10)
            clock += "0";
           
        clock += hh + ":";
        if (mm < 10) clock += '0'; 
        clock += mm; 
        return(clock); 
    }

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reply | quote | #⁷

广西河池市 2023-05-31, 16:58:32

js数组与字符串的相互转换方法

1、数组转字符串
需要将数组元素用某个字符连接成字符串，示例代码如下：

var a, b;
a = new Array(0,1,2,3,4);
b = a.join("-");      //"0-1-2-3-4"
2、字符串转数组

实现方法为将字符串按某个字符切割成若干个字符串，并以数组形式返回，示例代码如下：

var s = "abc,abcd,aaa";
ss = s.split(",");// 在每个逗号(,)处进行分解  ["abc", "abcd", "aaa"]
var s1 = "helloworld";
ss1 = s1.split('');  //["h", "e", "l", "l", "o", "w", "o", "r", "l", "d"]

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reply | quote | #⁸

广西河池市 2023-05-31, 17:15:22

js中数组的合并和对象的合并

1 数组合并
1.1 concat 方法

var a=[1,2,3],b=[4,5,6];
var c=a.concat(b);
console.log(c);// 1,2,3,4,5,6
console.log(a);// 1,2,3  不改变本身

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1.2 循环遍历

var arr1=['a','b'];
var arr2=['c','d','e'];
 
for(var i=0;i<arr2.length;i++){
      arr1.push(arr2[i]) 
}
 
console.log(arr1);//['a','b','c','d','e']

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1.3 apply
合并数组arr1和数组arr2,使用Array.prototype.push.apply(arr1,arr2) or arr1.push.apply(arr1,arr2);

var arr1=['a','b'];
var arr2=['c','d','e'];
 
Array.prototype.push.apply(arr1,arr2);
 
//或者
 
arr1.push.apply(arr1,arr2);<br>console.log(arr1) //['a','b','c','d','e']

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2 对象合并
2.1 $.extend()

var obj1= {'a': 1};
var obj2= {'b': 1};
var c = $.extend(obj1, obj2);console.log(obj1); // {a: 1, b: 1}  obj1已被修改//或者 <br>var obj3 = $.extend({}, obj1, obj2) <br>console.log(obj3); //{a: 1, b: 1} 不会改变obj1,obj2

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2.2 遍历赋值

var obj1={'a':1};
var obj2={'b':2,'c':3};
for(var key in obj2){
     if(obj2.hasOwnProperty(key)===true){    <br>     //此处hasOwnProperty是判断自有属性，使用 for in 循环遍历对象的属性时，原型链上的所有属性都将被访问会避免原型对象扩展带来的干扰
           obj1[key]=obj2[key];
} 
}
 
console.log(obj1);//{'a':1,'b':2,'c':3};

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2.3 Obj.assign()
　　可以把任意多个的源对象自身的可枚举属性拷贝给目标对象，然后返回目标对象。
　　Object.assign(target, ...sources)

//a. 复制一个对象<br>var obj = { a: 1 ,b:2};
var copyObj = Object.assign({}, obj);
console.log(copyObj); // { a: 1,b:2 }<br><br>//b.合并多个对象var o1 = { a: 1 };
var o2 = { b: 2 };
var o3 = { c: 3 };
 
var obj = Object.assign(o1, o2, o3);
console.log(obj); // { a: 1, b: 2, c: 3 }
console.log(o1);  // { a: 1, b: 2, c: 3 }, 且目标对象自身也会改变

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2.4 对象的深拷贝和浅拷贝
2.4.1 浅拷贝

var obj1={'a':1};
var obj2={'b':{'b1':22,'b2':33}};

$.extend(obj1, obj2);   //obj1拷贝了obj2的属性

console.log(obj1)  // {'a':1,'b'{'b1':22,'b2':33}}
console.log(obj1.b.b1)  // 22

obj2.b.b1=44;   //obj2重新赋值
console.log(obj1.b.b1)  // 44  obj1.b仅拷贝了对象的指引，所以受原obj2的影响

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2.4.2 深拷贝

var obj1={'a':1};
var obj2={'b':{'b1':22,'b2':33}};

$.extend(true,obj1, obj2);   //第一个参数设为true表示深复制

console.log(obj1)  // {'a':1,'b'{'b1':22,'b2':33}}
console.log(obj1.b.b1)  // 22

obj2.b.b1=44;   //obj2重新赋值
console.log(obj1.b.b1)  // 22 obj1拷贝了obj2的所有属性以及值，并不受obj2的影响

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reply | quote | #⁹

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