fix: 修复 image 组件 contentPath 字段默认为空导致 img 请求空问题

src/core/view/components/image/index.vue

-<template>
-  <uni-image v-on="$listeners">
-    <div
-      ref="content"
-      :style="style"
-    />
-    <img :src="contentPath">
-    <v-uni-resize-sensor
-      v-if="mode === 'widthFix' || mode === 'heightFix'"
-      ref="sensor"
-      @resize="_fixSize()"
-    />
-  </uni-image>
-</template>
-<script>
-function fixNumber (number) {
-  // fix: 解决 Chrome 浏览器上某些情况下导致 1px 缝隙的问题
-  if (typeof navigator && navigator.vendor === 'Google Inc.' && number > 10) {
-    number = Math.round(number / 2) * 2
-  }
-  return number
-}
-
-export default {
-  name: 'Image',
-  props: {
-    src: {
-      type: String,
-      default: ''
-    },
-    mode: {
-      type: String,
-      default: 'scaleToFill'
-    },
-    // TODO 懒加载
-    lazyLoad: {
-      type: [Boolean, String],
-      default: false
-    }
-  },
-  data () {
-    return {
-      originalWidth: 0,
-      originalHeight: 0,
-      originalStyle: { width: '', height: '' },
-      contentPath: ''
-    }
-  },
-  computed: {
-    ratio () {
-      return this.originalWidth && this.originalHeight ? this.originalWidth / this.originalHeight : 0
-    },
-    style () {
-      let size = 'auto'
-      let position = ''
-      const repeat = 'no-repeat'
-
-      switch (this.mode) {
-        case 'aspectFit':
-          size = 'contain'
-          position = 'center center'
-          break
-        case 'aspectFill':
-          size = 'cover'
-          position = 'center center'
-          break
-        case 'widthFix':
-        case 'heightFix':
-          size = '100% 100%'
-          break
-        case 'top':
-          position = 'center top'
-          break
-        case 'bottom':
-          position = 'center bottom'
-          break
-        case 'center':
-          position = 'center center'
-          break
-        case 'left':
-          position = 'left center'
-          break
-        case 'right':
-          position = 'right center'
-          break
-        case 'top left':
-          position = 'left top'
-          break
-        case 'top right':
-          position = 'right top'
-          break
-        case 'bottom left':
-          position = 'left bottom'
-          break
-        case 'bottom right':
-          position = 'right bottom'
-          break
-        default:
-          size = '100% 100%'
-          position = '0% 0%'
-          break
-      }
-
-      return {
-        'background-image': this.contentPath ? `url("${this.contentPath}")` : 'none',
-        'background-position': position,
-        'background-size': size,
-        'background-repeat': repeat
-      }
-    }
-  },
-  watch: {
-    src (newValue, oldValue) {
-      this._loadImage()
-    },
-    mode (newValue, oldValue) {
-      if (oldValue === 'widthFix' || oldValue === 'heightFix') {
-        this._resetSize()
-      }
-      if (newValue === 'widthFix' || newValue === 'heightFix') {
-        this._fixSize()
-      }
-    }
-  },
-  mounted () {
-    this.originalStyle.width = this.$el.style.width || ''
-    this.originalStyle.height = this.$el.style.height || ''
-    this._loadImage()
-  },
-  beforeDestroy () {
-    this._clearImage()
-  },
-  methods: {
-    _fixSize () {
-      if (this.ratio) {
-        const $el = this.$el
-        const rect = $el.getBoundingClientRect()
-        if (this.mode === 'widthFix') {
-          const width = rect.width
-          if (width) {
-            $el.style.height = fixNumber(width / this.ratio) + 'px'
-          }
-        } else if (this.mode === 'heightFix') {
-          const height = rect.height
-          if (height) {
-            $el.style.width = fixNumber(height * this.ratio) + 'px'
-          }
-        }
-      }
-    },
-    _resetSize () {
-      this.$el.style.width = this.originalStyle.width
-      this.$el.style.height = this.originalStyle.height
-    },
-    _resetData () {
-      this.originalWidth = 0
-      this.originalHeight = 0
-      this.contentPath = ''
-    },
-    _loadImage () {
-      const realImagePath = this.$getRealPath(this.src)
-      if (realImagePath) {
-        const img = this._img = this._img || new Image()
-        img.onload = $event => {
-          this._img = null
-          this.originalWidth = img.width
-          this.originalHeight = img.height
-
-          this._fixSize()
-
-          this.contentPath = realImagePath
-
-          this.$trigger('load', $event, {
-            width: img.width,
-            height: img.height
-          })
-        }
-        img.onerror = $event => {
-          this._img = null
-          this._resetData()
-          // 与微信小程序保持一致，保留之前样式
-          // this._resetSize()
-          this.$trigger('error', $event, {
-            errMsg: `GET ${this.src} 404 (Not Found)`
-          })
-        }
-        img.src = realImagePath
-      } else {
-        this._clearImage()
-        // 与微信小程序保持一致，保留之前样式
-        // this._resetData()
-        this._resetSize()
-      }
-    },
-    _clearImage () {
-      const img = this._img
-      if (img) {
-        img.onload = null
-        img.onerror = null
-        this._img = null
-      }
-    }
-  }
-}
-</script>
-<style>
-uni-image {
-  width: 320px;
-  height: 240px;
-  display: inline-block;
-  overflow: hidden;
-  position: relative;
-}
-
-uni-image[hidden] {
-  display: none;
-}
-
-uni-image > div {
-  width: 100%;
-  height: 100%;
-}
-
-uni-image > img {
-  -webkit-touch-callout: none;
-  -webkit-user-select: none;
-  -moz-user-select: none;
-  display: block;
-  position: absolute;
-  top: 0;
-  left: 0;
-  width: 100%;
-  height: 100%;
-  opacity: 0;
-}
-
-uni-image > .uni-image-will-change {
-  will-change: transform;
-}
-</style>
+<template>
+  <uni-image v-on="$listeners">
+    <div
+      ref="content"
+      :style="style"
+    />
+    <img
+      v-if="contentPath"
+      :src="contentPath"
+    >
+    <v-uni-resize-sensor
+      v-if="mode === 'widthFix' || mode === 'heightFix'"
+      ref="sensor"
+      @resize="_fixSize()"
+    />
+  </uni-image>
+</template>
+<script>
+function fixNumber (number) {
+  // fix: 解决 Chrome 浏览器上某些情况下导致 1px 缝隙的问题
+  if (typeof navigator && navigator.vendor === 'Google Inc.' && number > 10) {
+    number = Math.round(number / 2) * 2
+  }
+  return number
+}
+
+export default {
+  name: 'Image',
+  props: {
+    src: {
+      type: String,
+      default: ''
+    },
+    mode: {
+      type: String,
+      default: 'scaleToFill'
+    },
+    // TODO 懒加载
+    lazyLoad: {
+      type: [Boolean, String],
+      default: false
+    }
+  },
+  data () {
+    return {
+      originalWidth: 0,
+      originalHeight: 0,
+      originalStyle: { width: '', height: '' },
+      contentPath: ''
+    }
+  },
+  computed: {
+    ratio () {
+      return this.originalWidth && this.originalHeight ? this.originalWidth / this.originalHeight : 0
+    },
+    style () {
+      let size = 'auto'
+      let position = ''
+      const repeat = 'no-repeat'
+
+      switch (this.mode) {
+        case 'aspectFit':
+          size = 'contain'
+          position = 'center center'
+          break
+        case 'aspectFill':
+          size = 'cover'
+          position = 'center center'
+          break
+        case 'widthFix':
+        case 'heightFix':
+          size = '100% 100%'
+          break
+        case 'top':
+          position = 'center top'
+          break
+        case 'bottom':
+          position = 'center bottom'
+          break
+        case 'center':
+          position = 'center center'
+          break
+        case 'left':
+          position = 'left center'
+          break
+        case 'right':
+          position = 'right center'
+          break
+        case 'top left':
+          position = 'left top'
+          break
+        case 'top right':
+          position = 'right top'
+          break
+        case 'bottom left':
+          position = 'left bottom'
+          break
+        case 'bottom right':
+          position = 'right bottom'
+          break
+        default:
+          size = '100% 100%'
+          position = '0% 0%'
+          break
+      }
+
+      return {
+        'background-image': this.contentPath ? `url("${this.contentPath}")` : 'none',
+        'background-position': position,
+        'background-size': size,
+        'background-repeat': repeat
+      }
+    }
+  },
+  watch: {
+    src (newValue, oldValue) {
+      this._loadImage()
+    },
+    mode (newValue, oldValue) {
+      if (oldValue === 'widthFix' || oldValue === 'heightFix') {
+        this._resetSize()
+      }
+      if (newValue === 'widthFix' || newValue === 'heightFix') {
+        this._fixSize()
+      }
+    }
+  },
+  mounted () {
+    this.originalStyle.width = this.$el.style.width || ''
+    this.originalStyle.height = this.$el.style.height || ''
+    this._loadImage()
+  },
+  beforeDestroy () {
+    this._clearImage()
+  },
+  methods: {
+    _fixSize () {
+      if (this.ratio) {
+        const $el = this.$el
+        const rect = $el.getBoundingClientRect()
+        if (this.mode === 'widthFix') {
+          const width = rect.width
+          if (width) {
+            $el.style.height = fixNumber(width / this.ratio) + 'px'
+          }
+        } else if (this.mode === 'heightFix') {
+          const height = rect.height
+          if (height) {
+            $el.style.width = fixNumber(height * this.ratio) + 'px'
+          }
+        }
+      }
+    },
+    _resetSize () {
+      this.$el.style.width = this.originalStyle.width
+      this.$el.style.height = this.originalStyle.height
+    },
+    _resetData () {
+      this.originalWidth = 0
+      this.originalHeight = 0
+      this.contentPath = ''
+    },
+    _loadImage () {
+      const realImagePath = this.$getRealPath(this.src)
+      if (realImagePath) {
+        const img = this._img = this._img || new Image()
+        img.onload = $event => {
+          this._img = null
+          this.originalWidth = img.width
+          this.originalHeight = img.height
+
+          this._fixSize()
+
+          this.contentPath = realImagePath
+
+          this.$trigger('load', $event, {
+            width: img.width,
+            height: img.height
+          })
+        }
+        img.onerror = $event => {
+          this._img = null
+          this._resetData()
+          // 与微信小程序保持一致，保留之前样式
+          // this._resetSize()
+          this.$trigger('error', $event, {
+            errMsg: `GET ${this.src} 404 (Not Found)`
+          })
+        }
+        img.src = realImagePath
+      } else {
+        this._clearImage()
+        // 与微信小程序保持一致，保留之前样式
+        // this._resetData()
+        this._resetSize()
+      }
+    },
+    _clearImage () {
+      const img = this._img
+      if (img) {
+        img.onload = null
+        img.onerror = null
+        this._img = null
+      }
+    }
+  }
+}
+</script>
+<style>
+uni-image {
+  width: 320px;
+  height: 240px;
+  display: inline-block;
+  overflow: hidden;
+  position: relative;
+}
+
+uni-image[hidden] {
+  display: none;
+}
+
+uni-image > div {
+  width: 100%;
+  height: 100%;
+}
+
+uni-image > img {
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  display: block;
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  opacity: 0;
+}
+
+uni-image > .uni-image-will-change {
+  will-change: transform;
+}
+</style>