去除字符串中最后一个指定的字符

 function deleteLastStr(origin, str) {
        if (typeof origin === "string" && typeof str === 'string') {

            var arr = origin.split('')
            arr.splice(origin.lastIndexOf(str), 1);
            return arr.join('');

        } else {
            throw "数据类型错误";
        }
    }
    console.log(deleteLastStr('origin', 'n'));// origi

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demo演示地址:http://demo.crazyming.com/?link=topic/d3/去除字符串中最后一个指定的字符.html