Vue v-bind 指令

https://www.bilibili.com/video/BV12J411m7MG/?p=13

设置元素的属性（比如：src，title，class）

<div id="app">
  <img v-bind:src="imgSrc">
  <img v-bind:title="imgTitle + '!!!'">
  <img class="active">
  <img v-bind:class="isActive?'active':''">
  <img v-bind:class="{active:isActive}">

  <img :src="imgSrc">
  <img :title="imgTitle + '!!!'">
  <img :class="isActive?'active':''">
  <img :class="{active:isActive}">
</div>

var app = new Vue({
  el:"#app",
  data:{
    imgSrc:"图片地址",
    imgTitle:"hello world",
    isActive:false
  }
})