1.两种绑定方式

<div v-on:mouseover="handleOver($event)" v-on:mouseout="handleOut($event)"></div>
<div @mouseover="mouseOver" @mouseleave="mouseLeave"></div>
 
 
handleOver (e) {
    console.log('移入:', e);
    e.currentTarget.className = "xxx";
},
 
handleOut (e) {
    console.log('移出:', e);
    e.currentTarget.className = "yyy";
},
mouseOver () {},
 
mouseLeave () {}
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