vue图片懒加载

vue-lazyload

npm引入:npm i vue-lazyload -S
CDN引入:[https://unpkg.com/vue-lazyload/vue-lazyload.js](https://unpkg.com/vue-lazyload/vue-lazyload.js)

 

使用:

main.js:

import Vue from 'vue'
import App from './App.vue'
import VueLazyload from 'vue-lazyload'
 
Vue.use(VueLazyload)
 
// or with options
Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'dist/error.png',
  loading: 'dist/loading.gif',
  attempt: 1
})
 
new Vue({
  el: 'body',
  components: {
    App
  }
})

template:

<ul>
  <li v-for="img in list">
    <img v-lazy="img.src" >
  </li>
</ul>

Constructor Options

keydescriptiondefaultoptions
preLoad proportion of pre-loading height 1.3 Number
error src of the image upon load fail 'data-src' String
loading src of the image while loading 'data-src' String
attempt attempts count 3 Number
listenEvents events that you want vue listen for ['scroll', 'wheel', 'mousewheel', 'resize', 'animationend', 'transitionend', 'touchmove'] Desired Listen Events
adapter dynamically modify the attribute of element { } Element Adapter
filter the image's listener filter { } Image listener filter
lazyComponent lazyload component false Lazy Component
dispatchEvent trigger the dom event false Boolean
throttleWait throttle wait 200 Number
observer use IntersectionObserver false Boolean
observerOptions IntersectionObserver options { rootMargin: '0px', threshold: 0.1 } IntersectionObserver
silent do not print debug info true

Desired Listen Events

Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'dist/error.png',
  loading: 'dist/loading.gif',
  attempt: 1,
  // the default is ['scroll', 'wheel', 'mousewheel', 'resize', 'animationend', 'transitionend']
  listenEvents: [ 'scroll' ]
})

Methods

Event Hook

vm.Lazyload.on(event, callback) vm.Lazyload.off(event, callback) vm.Lazyload.once(event, callback)

on Listen for a custom events loading, loaded, erroronce Listen for a custom event, but only once. The listener will be removed once it triggers for the first time.
$off Remove event listener(s).

vm.Lazyload.on

Example
vm.$Lazyload.$on('loaded', function ({ bindType, el, naturalHeight, naturalWidth, $parent, src, loading, error }, formCache) {
  console.log(el, src)
})

vm.Lazyload.once

Example
vm.$Lazyload.$once('loaded', function ({ el, src }) {
  console.log(el, src)
})

vm.Lazyload.off

If only the event is provided, remove all listeners for that event

Example
function handler ({ el, src }, formCache) {
  console.log(el, src)
}
vm.$Lazyload.$on('loaded', handler)
vm.$Lazyload.$off('loaded', handler)
vm.$Lazyload.$off('loaded')

Performance

this.$Lazyload.$on('loaded', function (listener) {
  console.table(this.$Lazyload.performance())
});

this.$Lazyload.$once('loaded', function (listener) {
  console.table(this.$Lazyload.performance())
})

[原文具体api链接:](https://www.npmjs.com/package/vue-lazyload](https://www.npmjs.com/package/vue-lazyload)



作者:O蚂蚁O
链接:https://www.jianshu.com/p/d451dc1b5232
来源:简书
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。

posted on 2020-06-10 14:18  漫思  阅读(1266)  评论(0编辑  收藏  举报

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