分别去字符串前后，左边，右边空格

复制代码 代码如下:

String.prototype.trim=function(){returnthis.replace(/^s+|s+$/g,"")}

String.prototype.ltrim=function(){returnthis.replace(/^s+/g,"")}

String.prototype.rtrim=function(){returnthis.replace(/s+$/g,"")}