Vue.js - 自定义一个JsonView组件（树形格式化显示JSON数据）

有时我们需要在页面上展示 json 数据，如果直接显示出来效果不太好。下面演示如何在 Vue.js 项目中创建一个专门的 Json 数据格式化组件，并使用它进行展示。

1，效果图

（1）JsonView 组件会自动对 JSON 数据进行格式化显示，同时具有语法高亮效果。

（2）同时点击节点头部的三角箭头，还可以对该节点进行展开、折叠操作。

2，组件代码（JsonView.vue）

<template>
  <div class="bgView">
    <div :class="['json-view', length ? 'closeable' : '']" :style="'font-size:' + fontSize+'px'">
    <span @click="toggleClose" :class="['angle', innerclosed ? 'closed' : '']" v-if="length">
    </span>
    <div class="content-wrap">
      <p class="first-line">
        <span v-if="jsonKey" class="json-key">"{{jsonKey}}": </span>
        <span v-if="length">
          {{prefix}}
          {{innerclosed ? ('...' + subfix) : ''}}
          <span  class="json-note">
           {{innerclosed ? (' // count: ' + length) : ''}}
          </span>
        </span>
        <span v-if="!length">{{isArray ? '[]' : '{}'}}</span>
      </p>
      <div v-if="!innerclosed && length" class="json-body">
        <template v-for="(item, index) in items">
          <json-view :closed="closed" v-if="item.isJSON" :key="index" :json="item.value"
                     :jsonKey="item.key" :isLast="index === items.length - 1"></json-view>
          <p class="json-item" v-else :key="index">
            <span class="json-key">
                {{(isArray ? '' : '"' + item.key + '"')}}
            </span>
            :
            <span class="json-value">
                {{item.value + (index ===
            items.length - 1 ? '' : ',')}}
            </span>
          </p>
        </template>
        <span v-show="!innerclosed" class="body-line"></span>
      </div>
      <p v-if="!innerclosed && length" class="last-line">
        <span>{{subfix}}</span>
      </p>
    </div>
  </div>
  </div>
</template>
 
<script>
  export default {
    name: 'jsonView',
    props: {
      json: [Object, Array],
      jsonKey: {
        type: String,
        default: ''
      },
      closed: {
        type: Boolean,
        default: false
      },
      isLast: {
        type: Boolean,
        default: true
      },
      fontSize: {
        type: Number,
        default: 13
      }
    },
    created() {
      this.innerclosed = this.closed
      this.$watch('closed', () => {
        this.innerclosed = this.closed
      })
    },
    data() {
      return {
        innerclosed: true
      }
    },
    methods: {
      isObjectOrArray(source) {
        const type = Object.prototype.toString.call(source)
        const res = type === '[object Array]' || type === '[object Object]'
        return res
      },
      toggleClose() {
        if (this.innerclosed) {
          this.innerclosed = false
        } else {
          this.innerclosed = true
        }
      }
    },
    computed: {
      isArray() {
        return Object.prototype.toString.call(this.json) === '[object Array]'
      },
      length() {
        return this.isArray ? this.json.length : Object.keys(this.json).length
      },
      subfix() {
        return (this.isArray ? ']' : '}') + (this.isLast ? '' : ',')
      },
      prefix() {
        return this.isArray ? '[' : '{'
      },
      items() {
        if (this.isArray) {
          return this.json.map(item => {
            const isJSON = this.isObjectOrArray(item)
            return {
              value: isJSON ? item : JSON.stringify(item),
              isJSON,
              key: ''
            }
          })
        }
        const json = this.json
        return Object.keys(json).map(key => {
          const item = json[key]
          const isJSON = this.isObjectOrArray(item)
          return {
            value: isJSON ? item : JSON.stringify(item),
            isJSON,
            key
          }
        })
      }
    }
  }
</script>
 
<style>
  .bgView {
    background-color: #fafafa;
  }
  .json-view {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    white-space: nowrap;
    padding-left: 20px;
    box-sizing: border-box;
  }
  .json-note {
    color: #909399;
  }
  .json-key {
    color: rgb(147, 98, 15);
  }
  .json-value {
    color: rgb(24, 186, 24);
  }
  .json-item {
    margin: 0;
    padding-left: 20px;
  }
  .first-line {
    padding: 0;
    margin: 0;
  }
  .json-body {
    position: relative;
    padding: 0;
    margin: 0;
  }
   
  .json-body .body-line {
    position: absolute;
    height: 100%;
    width: 0;
    border-left: dashed 1px #bbb;
    top: 0;
    left: 2px;
  }
  .last-line {
    padding: 0;
    margin: 0;
  }
  .angle {
    position: absolute;
    display: block;
    cursor: pointer;
    float: left;
    width: 20px;
    text-align: center;
    left: 0;
  }
  .angle::after {
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    vertical-align: middle;
    border-top: solid 4px #333;
    border-left: solid 6px transparent;
    border-right: solid 6px transparent;
  }
  .angle.closed::after {
    border-left: solid 4px #333;
    border-top: solid 6px transparent;
    border-bottom: solid 6px transparent;
  }
</style>

3，使用样例

<template>
  <div>
    <JsonView :json="JsonData"></JsonView>
  </div>
</template>
 
<script>
  import JsonView from '@/components/JsonView'
 
  export default {
    name: 'test',
    components: { JsonView },
    data() {
      return {
        JsonData: {
            error: 0,
            status: "success",
            date: "2019-09-18",
            results: [{
                    currentCity: "嘉兴",
                    weather_data: [{
                            date: "今天（周三）",
                            weather: "多云",
                            wind: "微风",
                            temperature: "23℃"
                        },
                        {
                            date: "明天（周四）",
                            weather: "雷阵雨转中雨",
                            wind: "微风",
                            temperature: "29～22℃"
                        }
                    ]
                },
                {
                    currentCity: "合肥市",
                    weather_data: [{
                            date: "今天（周三）",
                            weather: "多云",
                            wind: "东风3-4级",
                            temperature: "27℃"
                        },
                        {
                            date: "明天（周四）",
                            weather: "多云",
                            wind: "东北风3-4级",
                            temperature: "35～27℃"
                        }
                    ]
                }
            ]
        }
      }
    }
  }
</script>