汪汪一只猫
自IE9+以来的所有浏览器都有trim().对于那些不支持trim(),您可以从MDN:if (!String.prototype.trim) {
(function() {
// Make sure we trim BOM and NBSP
var rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g;
String.prototype.trim = function() {
return this.replace(rtrim, '');
};
})();}见此:String.prototype.trim=function(){return this.replace(/^\s+|\s+$/g, '');};String.prototype.ltrim=function(){return this.replace(/^\s+/,'');};String.prototype.rtrim=function(){return this.replace(/\s+$/,'');};String.prototype.fulltrim=function(){return this.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g,'').replace(/\s+/g,' ');};