Vue2引入外部js文件

新建一个js文件

loadJs(src) {
        return new Promise((resolve,reject)=>{
          let script = document.createElement('script');
          script.type = "text/javascript";
          script.src= src;
          document.body.appendChild(script);
            
          script.onload = ()=>{
            resolve();
          }
          script.onerror = ()=>{
            reject();
          }
        })
      }
export default loadJs

在vue文件中引入并使用

mounted(){
	loadJs('https://res.wx.qq.com/open/js/jweixin-1.3.2.js').then(()=>{
        console.log(wx.miniProgram);
      })
 }