去掉字符串的空格、前后字符

//2016-11-14 截取字符串两侧的空格 JavaScript

String.prototype.trim = function () {

    ///<summary>去掉字符串前后空格</summary>

    return this.replace(/(^\s*)|(\s*$)/g, "");

}

String.prototype.trimLeft = function () {

    ///<summary>去掉左边的空格</summary> 

    return this.replace(/^\s*/, "");

}

String.prototype.trimRight = function () {

    ///<summary>去除右边的空格</summary>

    return this.replace(/\s*$/, "");

}

String.prototype.trimIn = function () {

    ///<summary>去掉内部的的空格</summary> 

    return this.replace(/\s/g, "");

}

String.prototype.trimLast = function () {

    /// <summary>去掉最后一个字符 </summary>   

    return this.substr(0, this.length - 1);

}

String.prototype.trimFirst = function () {

    /// <summary>去掉首个字符 </summary>    

    return this.substr(1);

}