//实现函数
function fn3(num, length) { return (Array(length).join('0') + num).slice(-length); }
调用:
console.time('3'); fn3(); console.timeEnd('time3'); //chrome返回值:time3: 0ms
转载:http://wsj123.iteye.com/blog/2412696
//实现函数
function fn3(num, length) { return (Array(length).join('0') + num).slice(-length); }
调用:
console.time('3'); fn3(); console.timeEnd('time3'); //chrome返回值:time3: 0ms
转载:http://wsj123.iteye.com/blog/2412696