图片延迟加载-promise

图片延迟加载

// 图片懒加载
function createImg(url) {
  return new Promise((resolve, reject) => {
    if (url) {
      let imgEle = document.createElement("img");
      imgEle.src = url;
      resolve(imgEle);
    } else {
      reject("url ?");
    }
  });
}

promise 相关文章

promise 专栏地址

• promise.race
• promise.any
• promsie.all
• promise.allSettled