JS数组的遍历方法有两种：
第一种：一般的for循环，例如：
<code>var a = new Array("first", "second", "third")
for(var i = 0;i </code>输出的结果：fitst,second,third
第二种：用for...in 这种遍历的方式，例如：
<code>var arr = new Array("first", "second", "third")
for(var item in arr) {
document.write(arr[item]+",");
}</code>输出的结果：fitst,second,third
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