# Image 图片

图片容器，在保留原生 img 的特性下，支持懒加载，自定义占位、加载失败等

# 基础用法

可通过fit确定图片如何适应到容器框，同原生 object-fit。

fill

contain

cover

none

scale-down

<template>
  <div class="demo-image">
    <div class="block" v-for="fit in fits" :key="fit">
      <span class="demonstration">{{ fit }}</span>
      <jp-image style="width: 100px; height: 100px" :src="url" :fit="fit"></jp-image>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      fits: ['fill', 'contain', 'cover', 'none', 'scale-down'],
      url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg'
    }
  }
}
</script>
<style scoped lang="scss">
.demo-image {
  display: flex;
  align-items: center;
  .block {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
}
</style>

# 占位内容

可通过slot = placeholder可自定义占位内容

默认

自定义

加载中 ...

<template>
  <div class="demo-image__placeholder">
    <div class="block">
      <span class="demonstration">默认</span>
      <jp-image :src="src"></jp-image>
    </div>
    <div class="block">
      <span class="demonstration">自定义</span>
      <jp-image :src="src">
        <div slot="placeholder" class="image-slot">
          加载中
          <span class="dot">...</span>
        </div>
      </jp-image>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      src: 'https://cube.elemecdn.com/6/94/4d3ea53c084bad6931a56d5158a48jpeg.jpeg'
    }
  }
}
</script>
<style scoped>
.demo-image__placeholder {
  display: flex;
  align-items: center;
}
.block {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.block:first-child {
  margin-right: 10px;
}
.block:last-child {
  margin-left: 10px;
}
</style>

# 加载失败

可通过slot = error可自定义加载失败内容

默认

自定义

<template>
  <div class="demo-image__error">
    <div class="block">
      <span class="demonstration">默认</span>
      <jp-image></jp-image>
    </div>
    <div class="block">
      <span class="demonstration">自定义</span>
      <jp-image>
        <div slot="error" class="image-slot">
          <i class="jp-icon-document-delete"></i>
        </div>
      </jp-image>
    </div>
  </div>
</template>
<style scoped lang="less">
.demo-image__error {
  display: flex;
  align-items: center;
}
.block {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.block:first-child {
  margin-right: 10px;
}
.block:last-child {
  margin-left: 10px;
}
.jp-image {
  width: 50%;
  height: 200px;
  background: #f8f8f8;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
</style>

# 懒加载

可通过lazy开启懒加载功能，当图片滚动到可视范围内才会加载。可通过scroll-container来设置滚动容器，若未定义，则为最近一个overflow值为auto或scroll的父元素。

<template>
  <div class="demo-image__lazy">
    <jp-image v-for="url in urls" :key="url" :src="url" lazy></jp-image>
  </div>
</template>

<script>
export default {
  data() {
    return {
      urls: [
        'https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg',
        'https://fuss10.elemecdn.com/1/34/19aa98b1fcb2781c4fba33d850549jpeg.jpeg',
        'https://fuss10.elemecdn.com/0/6f/e35ff375812e6b0020b6b4e8f9583jpeg.jpeg',
        'https://fuss10.elemecdn.com/9/bb/e27858e973f5d7d3904835f46abbdjpeg.jpeg',
        'https://fuss10.elemecdn.com/d/e6/c4d93a3805b3ce3f323f7974e6f78jpeg.jpeg',
        'https://fuss10.elemecdn.com/3/28/bbf893f792f03a54408b3b7a7ebf0jpeg.jpeg',
        'https://fuss10.elemecdn.com/2/11/6535bcfb26e4c79b48ddde44f4b6fjpeg.jpeg'
      ]
    }
  }
}
</script>
<style scoped>
.demo-image__lazy {
  height: 300px;
  overflow: scroll;
}
</style>

# 大图预览

可通过 previewSrcList 开启预览大图的功能。

<template>
  <div class="demo-image__preview">
    <jp-image style="width: 100px; height: 100px" :src="url" :preview-src-list="srcList"></jp-image>
  </div>
</template>

<script>
export default {
  data() {
    return {
      url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg',
      srcList: [
        'https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg',
        'https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg'
      ]
    }
  }
}
</script>

# Attributes

参数	说明	类型	可选值	默认值
src	图片源，同原生	string	—	-
fit	确定图片如何适应容器框，同原生 object-fit (opens new window)	string	fill / contain / cover / none / scale-down	-
alt	原生 alt	string	-	-
referrer-policy	原生 referrerPolicy	string	-	-
lazy	是否开启懒加载	boolean	—	false
scroll-container	开启懒加载后，监听 scroll 事件的容器	string / HTMLElement	—	最近一个 overflow 值为 auto 或 scroll 的父元素
preview-src-list	开启图片预览功能	Array	—	-
z-index	设置图片预览的 z-index	Number	—	2000

# Events

事件名称	说明	回调参数
load	图片加载成功触发	(e: Event)
error	图片加载失败触发	(e: Error)

# Slots

名称	说明
placeholder	图片未加载的占位内容
error	加载失败的内容

← Result 结果 Alert 警告 →