Fendouche的博客

str1="{abcdef!";str3=""; for(var i=0;i<str1.length;i++) { str2=str1.charAt(i); str3+=String.fromCharCode(str2.charCodeAt()+3) }结果：str3="~defghi$"

效率方面经过我的测试，for高于另外两个方法。总体排序：for > forEach > map效率测试代码：var arr = [], max = 1000; for (var i = 1; arr.push(i++) < max;); var mapArr = [],forEachArr = [],forArr = []; console.time('map'); ar...