<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>JavaScript forEach</title>
<link rel="stylesheet" href="">
</head>
<body>
<script type="text/javascript">
var a = [‘a‘,‘b‘,‘c‘];
var s = new Set([‘a‘,‘b‘,‘c‘]);
var m = new Map([[1,‘x‘],[2,‘y‘],[3,‘z‘]]);
a.forEach(function(element,index,array){
console.log(element + " " + index + " " + array);
});
s.forEach(function(element,sameElement,set){
console.log(element + " " + sameElement + " " + set);
});
m.forEach(function(value,key,map){
console.log(value + " " + key + " " + map);
});
</script>
</body>
</html>本文出自 “素颜” 博客，请务必保留此出处http://suyanzhu.blog.51cto.com/8050189/1902768
原文：http://suyanzhu.blog.51cto.com/8050189/1902768