使用方式举例如下：
<script type="text/javascript"> var jsonranklist=[{"name":"ts","code":123456,"topscore":2000},{"xlid":"tb","code":123456,"topscore":1500}]; console.log(jsonranklist.length); //使用foreach循环 jsonranklist.forEach(function(e){
console.log(e.xlid);
}); //使用for in 循环 for (var cindxe in jsonranklist) { //var obj=JSON.stringify(dt); console.log(jsonranklist[cindxe].xlid); } </script>
但是IE7之前的版本并不支持Foreach，所以需要自定义方法：
//Array.forEach implementation for IE support.. //https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach if (!Array.prototype.forEach) { Array.prototype.forEach = function(callback, thisArg) { var T, k; if (this == null) { throw new TypeError(" this is null or not defined"); } var O = Object(this); var len = O.length >>> 0; // Hack to convert O.length to a UInt32 if ({}.toString.call(callback) != "[object Function]") { throw new TypeError(callback + " is not a function"); } if (thisArg) { T = thisArg; } k = 0; while (k < len) { var kValue; if (k in O) { kValue = O[k]; callback.call(T, kValue, k, O); } k++; } }; }
完整参考代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Author" CONTENT="oscar999"> </HEAD> <BODY> <script> if (!Array.prototype.forEach) { Array.prototype.forEach = function(callback, thisArg) { var T, k; if (this == null) { throw new TypeError(" this is null or not defined"); } var O = Object(this); var len = O.length >>> 0; // Hack to convert O.length to a UInt32 if ({}.toString.call(callback) != "[object Function]") { throw new TypeError(callback + " is not a function"); } if (thisArg) { T = thisArg; } k = 0; while (k < len) { var kValue; if (k in O) { kValue = O[k]; callback.call(T, kValue, k, O); } k++; } }; } var arryAll = []; arryAll.push(1); arryAll.push(2); arryAll.push(3); arryAll.push(4); arryAll.push(5); var arrySpecial = []; arryAll.forEach(function(e){ if(e%2==0) { arrySpecial.push(e); }else if(e%3==0) { arrySpecial.push(e); } }) </script> </BODY> </HTML>
参考博客地址：
http://blog.csdn.net/oscar999/article/details/8671546