自定義指令拖拽事件：採用自定義指令實現拖拽

<script>
    Vue.directive('drag',function(){
        var oDiv=this.el;
        oDiv.onmousedown=function(ev){
            var disX=ev.clientX-oDiv.offsetLeft;
            var disY=ev.clientY-oDiv.offsetTop;

            document.onmousemove=function(ev){
                var 
 
l=ev.clientX-disX;
                var t=ev.clientY-disY;
                oDiv.style.left=l+'px';
                oDiv.style.top=t+'px';
            };
            document.onmouseup=function(){
                document.onmousemove=null;
                document.onmouseup=null;
            };
        };
    });

    window
 
.onload=function(){
        var vm=new Vue({
            el:'#box',
            data:{
                msg:'welcome'
}
        });
    };

</script>

<div id="box">
    <div v-drag :style="{width:'100px', height:'100px', background:'blue', position:'absolute', right:0, top:0}"></div>
    <
 
div v-drag :style="{width:'100px', height:'100px', background:'red', position:'absolute', left:0, top:0}"></div>
</div>