img-lazyload

中文文档

It does not rely on high-performance JavaScript library, with a size of 2.4kb. It supports modification of src and other elements backgroundimage attributes under img tag by default.

Before using this library, you need to pay more attention to: for the elements that need to be loaded lazily, you must set a width height or an initial image.

<img src="xxx.png" />
<!-- or -->
<img src="xxx.png" style="width: 500px; width: 700px;" />

install

npm i @boses/img-lazyload
# or
yarn add @boses/img-lazyload

usage method

<!-- style -->
<style>
  img {
    width: 800px;
    height: 800px;
  }
</style>
<!-- body Element -->
<img data-src="http://pic2.nipic.com/20090422/1562745_010030787_2.jpg" />
<img
  data-src="https://gss0.baidu.com/9fo3dSag_xI4khGko9WTAnF6hhy/zhidao/pic/item/faedab64034f78f07595c8f874310a55b3191c1a.jpg"
/>
<img data-src="http://img.ylq.com/2016/0816/20160816094144656.jpg" />

import imgLazyload from "@boses/img-lazyload";
imgLazyload("img");

For the img tag, when the element is visible, the value of the data-src attribute of the element is assigned to the SRC attribute of the element;

For non img tags, backgroundimage is used by default. When the element is visible, the value of the element data-src attribute is assigned to the backgroundimage attribute of the element;

api

lazyload(el: el, option?: options): void

• el:string | Element | NodeList

option?

| name | type | default | required | describe | | -------- | ----------------------- | -------- | -------- | ------------------------------------- | | dataSrc | string | data-src | false | The actual URL address of the element | | callback | (el: Element) => void | none | false | callback |

The following is an advanced example. Load the image and clear the data-src attribute of the element. The style element of HTML is the same as above.

import imgLazyload from "@boses/img-lazyload";
imgLazyload("img", {
  callback(el) {
    const src = el.getAttribute("data-src");
    el.src = src;
    el.removeAttribute("data-src");
  },
});

License

MIT License