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上图：

声明
var myString = new String("Every good boy does fine."); var myString = "Every good boy does fine.";
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    字符串连接
    var myString = "Every " + "good boy " + "does fine."; var myString = "Every "; myString += "good boy does fine.";
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      截取字符串
      //截取第 6 位开始的字符 var myString = "Every good boy does fine."; var section = myString.substring(6); //结果: "good boy does fine." //截取第 0 位开始至第 10 位为止的字符 var myString = "Every good boy does fine."; var section = myString.substring(0,10); //结果: "Every good" //截取从第 11 位到倒数第 6 位为止的字符 var myString = "Every good boy does fine."; var section = myString.slice(11,-6); //结果: "boy does" //从第 6 位开始截取长度为 4 的字符 var myString = "Every good boy does fine."; var section = myString.substr(6,4); //结果: "good"
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        转换大小写
        var myString = "Hello"; var lcString = myString.toLowerCase(); //结果: "hello" var ucString = myString.toUpperCase(); //结果: "HELLO"
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          字符串比较
          var aString = "Hello!"; var bString = new String("Hello!"); if( aString == "Hello!" ){ } //结果: true if( aString == bString ){ } //结果: true if( aString === bString ){ } //结果: false (两个对象不同,尽管它们的值相同)
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            检索字符串
            var myString = "hello everybody."; // 如果检索不到会返回-1,检索到的话返回在该串中的起始位置 if( myString.indexOf("every") > -1 ){ } //结果: true
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              查找替换字符串
              var myString = "I is your father."; var result = myString.replace("is","am"); //结果: "I am your father."
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                特殊字符
                \b : 后退符 \t : 水平制表符 \n : 换行符 \v : 垂直制表符 \f : 分页符 \r : 回车符 \" : 双引号 \’ : 单引号 \ 反斜杆
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                  将字符转换成Unicode编码
                  var myString = "hello"; var code = myString.charCodeAt(3); //返回"l"的Unicode编码(整型) var char = String.fromCharCode(66); //返回Unicode为66的字符
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                    将字符串转换成URL编码
                    var myString = "hello all"; var code = encodeURI(myString); //结果: "hello%20all" var str = decodeURI(code); //结果: "hello all" //相应的还有: encodeURIComponent() decodeURIComponent()
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