jq给同一元素绑定多个事件

$(".aa").on("click",function(){
        alert(1)
    }).on("mousemove",function(){
        console.log(1);
    });

$(".aa").on({click:function(){
        alert(1)
    },mousemove:function(){
        console.log(2);
    }})

如果需要传参数，除定义全局变量，在方法中直接使用全局变量外，还可使用以下方法

$(".aa").on("click",{val:a},a1).on("mousemove",{val:b},a2);
    function a1(e){
        alert(e.data.val)
    }
    function a2(e){
        console.log(e.data.val)
    }

通过delegate给同一元素绑定多个事件

$("body").delegate(
            ".msg-layer",{
                mousedown: function (e) {
                    var el = $(".msg-layer");
                    var os = el.offset(),
                    dx = e.pageX - os.left, dy = e.pageY - os.top;
                    $(document).on('mousemove.drag', function (e) {
                        el.offset({top: e.pageY - dy, left: e.pageX - dx});
                    });
                },
                mouseup: function (e) {
                    $(document).off('mousemove.drag');
                }
            }
    );

$("body").delegate(
            ".msg-layer","mousedown mouseup",function(e){
                if(e.type == "mousedown"){
                    var el = $(".msg-layer");
                    var os = el.offset(),
                            dx = e.pageX - os.left, dy = e.pageY - os.top;
                    $(document).on('mousemove.drag', function (e) {
                        el.offset({top: e.pageY - dy, left: e.pageX - dx});
                    });
                }else if(e.type == "mouseup"){
                    $(document).off('mousemove.drag');
                }
            }
    );