Javascript函数将文本拆分为相同长度的两个字符串

下面是如何查找靠近中间的空间位置的方法：

var s="Today is Monday, tomorrow is Tuesday, after tomorrow is Wednesday."; var p=s.slice(s.length/2).split("").slice(1).join("").length;s.slice(0, s.length-p) +"n" + s.slice(s.length-p);/* =="Today is Monday, tomorrow is Tuesday,  after tomorrow is Wednesday." */