var img=new Image();
    img.addEventListener("load",loadHandler);
    img.src="./img/1.jpg";
    document.body.appendChild(img);
    console.log(img.width)；

    function loadHandler(e){
      console.log(img.width);//當(dāng)前圖片的原始寬度
    }

var num=1;
    var list=[];
    loadImage();
    function loadImage(){
      var img=new Image();
      img.addEventListener("load",loadHandler);
      img.src="./img/"+num+".jpg";
    }
    function loadHandler(e){
      list.push(this.cloneNode());//復(fù)制當(dāng)前圖片元素
      num++;
      if(num>100){console.log(list);return;}
      this.src="./img/"+num+".jpg"; //修改地址繼續(xù)后觸發(fā)load事件
    }

function loadImage(src){
    return new Promise(function(resolve,reject){
      let img=new Image();
      img.onload=function(){ 
        resolve(img);//加載時(shí)執(zhí)行resolve函數(shù)
      }
      img.onerror=function(){ 
        reject(src+'這個(gè)地址錯(cuò)誤');//拋出異常時(shí)執(zhí)行reject函數(shù)
      }
      img.src=src;
    })
  }
  function* fn(){
    for(let i=1;i<100;i++){
      yield loadImage("./img/"+i+".jpg");
    }
  }
  let s=fn();
  let value=s.next().value; 
  resume();
  function resume(){
    value.then(img=>{
      console.log(img);//打印加載的圖片標(biāo)簽
      value=s.next().value;
      if(value)resume();
    });
  }

function loadImage(src){
    let p=new Promise(function(resolve,reject){
      let img=new Image();
      img.onload=function(){//加載時(shí)執(zhí)行resolve函數(shù)
        resolve(img);
      }
      img.onerror=function(){
        reject(src);
      }
      img.src=src;
    })
    return p;
  }
  async function fn(){
    let arr=[];
    for(let i=3;i<80;i++){
      await loadImage(`./img/${i}-.jpg`).then(img=>{
        arr.push(img);
      });
    }
    return arr;
  }
  fn().then(list=>{
    console.log(list);//打印圖片數(shù)組
  })