练习
拖动页面中的元素
onmouseover onmouseout
onmousedown onmousemove onmouseup
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>指令</title>
<script type="text/javascript" src="js/vue.min.js"></script>
</head>
<style type="text/css">
#itany{
width:300px;
height:300px;
position:absolute;
background:pink;
}
#itany .one{
background-color: red;
top: 0;
left:0;
width:100px;
height:100px;
position: absolute;
}
#itany .two{
background-color: blue;
top:0;
right:0;
position: absolute;
width:100px;
height:100px;
}
</style>
<body>
<div id="itany">
<div class="one" v-drag>itany</div>
<div class="two" v-drag>shehui</div>
</div>
</body>
<script type="text/javascript">
Vue.directive('drag',function(el){
el.onmousedown=function(e){
// 获取鼠标点击处分别与div左边和上边的距离：鼠标位置-div位置;
var disX = e.clientX-el.offsetLeft;
var disY = e.clientY-el.offsetTop;
console.log(disX,disY);
// 包含在ononmousedown里面，表示点击后才移动，为防止鼠标移除div,使用document.onmousemove
document.onmousemove= function (e) {
var l = e.clientX - disX;
var t = e.clientY - disY;
el.style.left = l +'px';
el.style.top = t + 'px';
}
document.onmouseup = function(e){
document.onmousemove = null;
document.onmouseup = null;
}
}
})
var vm = new Vue({
el:'#itany',
data:{
msg:'welcome to itany',
username:'alice'
},
methods:{
change(){
this.msg="欢迎来到北京";
}
},
})
</script>
</html>
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