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