外部事件触发调用对象方法时this指向问题

    var obj = {
        name: ‘dang‘,
        test:function(){
            alert(this.name);
        }
    };
    obj.test(); //这样是可以的
    $(‘.box‘).click(obj.test); //undefined

    var obj = {
        name: ‘dang‘,
        test:function(){
            var _this = obj;
            alert(_this.name);
        }
    };
    $(‘.box‘).click(obj.test); 

    var obj = {
        name: ‘dang‘,
        test:function(){
            alert(this.name);
        }
    };
    $(‘.box‘).click($.proxy(obj,‘test‘));