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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

    检查array是否为空

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