前端学习案例-重写foreach 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>重写foreach</title>
</head>
<body>
    <script>
        Array.prototype.foreach=function(cb){
            const _arr=this
            var _len=_arr.length
            var _arg2=arguments[1]||window
            for(var i=0;i<_len;i++){
                cd.apply(_arg2,[_arr[i],i,_arr])
            }
        }
    </script>
</body>
</html>

posted @ 2022-08-26 20:35  前端导师歌谣  阅读(34)  评论(0)    收藏  举报