2019獨角獸企業重金招聘Python工程師標準>>>

var testArrs = [],i = 0; while (i < 40000000) {testArrs.push(i);i++; }function testForeach (arr) {console.time("foreach");var newArr = [];arr.forEach(function (i) {newArr.push(i);});console.timeEnd("foreach"); }function testNoDeclare (arr) {console.time("no declare");var newArr = [];for (var i = 0; i < arr.length; i++) {newArr.push(i);}console.timeEnd("no declare"); }function testUseDeclare (arr) {console.time("use declare");var newArr = [];for (var i = 0, len = arr.length; i < len; i++) {newArr.push(i);}console.timeEnd("use declare"); }// testForeach(testArrs); // 17.94066006783 18.810510252937 20.686124714573 18.864875889506 18.103756977537 //testUseDeclare(testArrs); // 5.110369837503 6.4151451151633 5.0288213826492 5.0288213826492 4.6754447449496 testNoDeclare(testArrs); // 6.6054248431555 5.8171231129024 5.0288213826492 5.7355746580486 5.0831870192184

轉載于:https://my.oschina.net/u/3150903/blog/1600699

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