vue项目js导入加载顺序详解

 var block = document.getElementById("block");    
 // 绑定touchstart事件
block.addEventListener("touchstart", function(e) {});

import {touchAction} from '../../static/js/touchAction.js';

 mounted(){   touchAction();
  },

<img src="../../static/pic/btn-control.png" alt="" class="control-derection" id="block">

export let touchAction = function () {
    console.log("clientWidth:"+document.body.clientWidth);    var block = document.getElementById("block");
    block.addEventListener("touchstart", function(e) {})
}