vue自己封装的文本根据字数来展开（全部显示）收起（保留一定字数以内）的插件_vue实现文字逐个显示

子组件：

Html

<template>
  <div>
    <div class="demo_text">
          {{textLength}}
    </div>
    <div v-show="this.data.length>this.length">
  <div class="show" v-show="fold" @click="expand()">展开</div>
  <div class="show" v-show="!fold" @click="noexpand()">收起</div>
    </div>
  </div>
</template>
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Css

<style lang="scss" scoped>
    body{
      /*只显示五行*/
      .demo_text{
        /*强制换行*/
        word-wrap:break-word;
        width: 100%;
      }
      .show{
        font-size: 13px;
        color:cornflowerblue;
      }
    }
</style>
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JS

<script>
    export default {
        name: "text-flow",
      data(){
            return {
              fold : true,
              datas : this.data,
              lengths : this.length,
              reallength : 0
            }
      },
      props:{
          data : {
            type : String,
            default : ''
          },
          length : {
            type : Number,
            default : 0
          },
      },
      computed :{
          textLength: function ()
         {
              if ( this.datas.length>this.lengths) {
                  this.fold == true;
                  return this.datas.trim().substring(0,this.lengths)+"...";
              }else {
                  this.fold == false;
                return  this.datas
              }
          }
      },
      methods:{
          expand(){
            this.reallength = this.lengths;
            this.lengths = this.datas.length;
            this.fold = !this.fold;
          },
        noexpand(){
            this.lengths = this.reallength;
            this.fold = !this.fold;
        },
      }
    }
</script>
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父组件调用封装好的子组件

需要传的参数：data=》文本内容；length=》规定的字数限制
html

<template>
    <div>
          <Itext :data="data" :length="length"></Itext>
      <Itext :data="data1" :length="length"></Itext>
    </div>
</template>
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JS

<script>
    import Itext from './text-flow'
    export default {
        name: "instanceClass",
        data(){
            return {
                data : "HelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorld" +
                  "HelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorld" +
                  "HelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorld" +
                  "HelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorldHelloWorld",
                data1 : "Javascript",
                length : 20,
            }
        },
        components : {
          Itext
        }
    }
</script>
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至此OK，是不是很简单哈哈，效果如下

由于JavaScript没有达到规定字数限制，故没有展开隐藏botton-group

样式我没做具体处理，到时候根据需求设计即可！