JavaScript判断前缀、后缀和是否全是空格
// Js 判断后缀 String.prototype.endsWith = function(suffix) { return this.indexOf(suffix, this.length - suffix.length) !== -1; }; // Js 判断前缀 if (typeof String.prototype.startsWith != 'function') { // see below for better implementation! String.prototype.startsWith = function (str){ return this.indexOf(str) == 0; }; } // Js 判空(含全部是空格) String.prototype.IsNullEmptyOrSpace = function() { if (this== null) return true; return this.replace(/s/g, '').length == 0; };