1. 传值：获取当前的数组的index位的数据

<tr  v-for="(item,index) in message_List">
     <td @click="reply(message_List[index].phone_num)">{{item.phone_num}}</td>
</tr>

reply: function (e) {
     console.log("number:" + e);                   
},

2. 获取dom

<div @click="show_msg($event)" style="width:100px;" class="msg_content">{{item.rec_msg}}</div>

show_msg: function (e) {
     var msg = e.target;
     console.log(msg);
     console.log(msg.style.width);
}