function check(str)
{
    var lastIndex = str.lastIndexOf('/');
    return (lastIndex != -1) && (lastIndex  == (str.length - 1));
}

7岁的帖子，但我不能理解前几篇帖子，因为它们很复杂。所以，我写了自己的解决方案:

function strEndsWith(str, endwith)
{
    var lastIndex = url.lastIndexOf(endsWith);
    var result = false;
    if (lastIndex > 0 && (lastIndex + "registerc".length) == url.length)
    {
        result = true;
    }
    return result;
}

对于coffeescript

String::endsWith = (suffix) ->
  -1 != @indexOf suffix, @length - suffix.length

这是另一个对我来说很有魅力的快速替代方法，使用正则表达式:

// Would be equivalent to:
// "Hello World!".endsWith("World!")
"Hello World!".match("World!$") != null

我不知道你怎么想，但是:

var s = "mystring#";
s.length >= 1 && s[s.length - 1] == '#'; // will do the thing!

为什么是正则表达式?为什么要破坏原型?字符串的子串吗?来吧……

if(typeof String.prototype.endsWith !== "function") {
    /**
     * String.prototype.endsWith
     * Check if given string locate at the end of current string
     * @param {string} substring substring to locate in the current string.
     * @param {number=} position end the endsWith check at that position
     * @return {boolean}
     *
     * @edition ECMA-262 6th Edition, 15.5.4.23
     */
    String.prototype.endsWith = function(substring, position) {
        substring = String(substring);

        var subLen = substring.length | 0;

        if( !subLen )return true;//Empty string

        var strLen = this.length;

        if( position === void 0 )position = strLen;
        else position = position | 0;

        if( position < 1 )return false;

        var fromIndex = (strLen < position ? strLen : position) - subLen;

        return (fromIndex >= 0 || subLen === -fromIndex)
            && (
                position === 0
                // if position not at the and of the string, we can optimise search substring
                //  by checking first symbol of substring exists in search position in current string
                || this.charCodeAt(fromIndex) === substring.charCodeAt(0)//fast false
            )
            && this.indexOf(substring, fromIndex) === fromIndex
        ;
    };
}

好处:

这个版本不仅仅重用了indexOf。 在长弦上的最佳表现。这里有一个速度测试http://jsperf.com/starts-ends-with/4 完全兼容ecmascript规范。它通过了测试