在前面已经定义了var 1=arr.length,为什么用alert(var 1)不能弹出窗口？
var arr = ['*','##',"***","&&","****","##*"];
arr[7] = "**";
//数组长度
var l = arr.length;
alert(arr.length);
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var arr = ['*','##',"***","&&","****","##*"];
arr[7] = "**";
//数组长度
var l = arr.length;
alert(arr.length);
2017-02-10
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