1.html

<el-dialog id="clickMe" @click="clicked">
	<img :src="dialogImageUrl" width="100%">
</el-dialog>

2.js

methods: {
    myFunc: function() {
      setTimeout(function() {
        // IE
        debugger
        if (document.all) {
          document.getElementById('clickMe').click()
        } else { // 其它浏览器
          var e = document.createEvent('MouseEvents')
          e.initEvent('click', true, true)
          document.getElementById('clickMe').dispatchEvent(e)
        }
      }, 2000)
    }
   }