参考地址

• https://blog.csdn.net/weixin_40902181/article/details/100302528

代码

String.prototype.endWith = function (endStr) {
    var d = this.length - endStr.length;
    return (d >= 0 && this.lastIndexOf(endStr) == d);
}

调用

var str="I love antzone";
console.log(str.endWith("ne"));