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- // 简单实现下 Array.prototype.map 的功能。
- var arrayMap = function( ary, callback ){
- var i = 0,
- length = ary.length, value,
- ret = [];
- for ( ; i < length; i++ ){
- value = callback( i, ary[ i ] );
- ret.push(value );
- }
- return ret;
- }
- var a = arrayMap([ 1, 2, 3 ], function( i, n ){
- return n * 2;
- });
- console.log(a);
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