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JavaScript數組的 forEach()方法調用數組中的每個元素。
文法
array.forEach(callback[, thisObject]);
下面是參數的詳細資料：
傳回值:
返回建立數組。
相容性：
這種方法是一個JavaScript擴充到ECMA-262標準;因此它可能不存在在標準的其他實現。為了使它工作，你需要添加下面的指令碼代碼的頂部：
if (!Array.prototype.forEach){ Array.prototype.forEach = function(fun /*, thisp*/) { var len = this.length; if (typeof fun != "function") throw new TypeError(); var thisp = arguments[1]; for (var i = 0; i < len; i++) { if (i in this) fun.call(thisp, this[i], i, this); } };}
例子：
<html><head><title>JavaScript Array forEach Method</title></head><body><script type="text/javascript">if (!Array.prototype.forEach){ Array.prototype.forEach = function(fun /*, thisp*/) { var len = this.length; if (typeof fun != "function") throw new TypeError(); var thisp = arguments[1]; for (var i = 0; i < len; i++) { if (i in this) fun.call(thisp, this[i], i, this); } };}function printBr(element, index, array) { document.write("<br />[" + index + "] is " + element ); }[12, 5, 8, 130, 44].forEach(printBr); </script></body></html>
這將產生以下結果：
[0] is 12[1] is 5[2] is 8[3] is 130[4] is 44
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