Array map 数组映射的实现

时间:2015-05-16 11:55:04   收藏:0   阅读:136

<!doctype html>
<html>
<script type="text/javascript">

Array.prototype.map = function(fn){
for(var i =0; i< this.length; i++){
this[i] = fn(this[i], i);
}
return this;
}

var a=[1,2,3,4,5];
a.map(function(v){
return v*v;
});
console.log(a);

</script>
</html>

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