(function(){

    this.sendAjax = function(url,func,formData,type){

        type = type || "POST"; //默认为POST的方式

        var xhr = new XMLHttpRequest();

        if( typeof xhr.withCredentials===undefined ){

            return alert("对不起，您的浏览器不支持：XMLHttpRequest");

        }

        xhr.onload = func;

        xhr.open(type,url,true);

        if( undefined!==formData ){

            xhr.send(formData);

        }else{

            xhr.send();

        }

    }

    this.$one = function(name){

        return document.querySelector(name);

    }

    this.$all = function (name){

        return document.querySelectorAll(name);

    }

    this.stopPropagation = function(e) {

        e = e || window.event;

        if(e.stopPropagation) { //W3C阻止冒泡方法

            e.stopPropagation();

        } else {

            e.cancelBubble = true; //IE阻止冒泡方法

        }

    }

    String.prototype.trim = function() {

        return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');

    }

})();