How vue.js traverses an array-Vue.js-php.cn

How vue.js traverses an array

coldplay.xixi

Release： 2020-11-26 15:24:01

Original

12997 people have browsed it

Vue.js method of traversing arrays: 1. Use a foreach loop, the code is [this.urls.forEach(item =>]; 2. Use a filter loop, the code is [return this.urls.filter (item =>】.

How vue.js traverses an array

##This method is suitable for all brands of computers

vue.js method of traversing arrays:

1, foreach

Return cannot be used for foreach loops To stop the loop

search(keyword){
    var newList = []
    this.urls.forEach(item =>{
     if(item.name.indexOf(keyword) != -1){
      newList.push(item)
     }
    })
    return newList
   }

Copy after login

2、filter

The item object is an element in the traversed array, and includes is a new method in es6. The search method directly returns the new array

search(keyword){
    return this.urls.filter(item =>{
     if(item.name.includes(keyword)){
      return item
   }
 })
}

Copy after login

3, findIndex

After returning true, the index can obtain the matching elements and delete them

del(row){
     this.$confirm("确定要删除吗？", "删除").then(action=>{
     var index = this.urls.findIndex(item =>{
      if(item.name == row.name){
       return true;
      }
     })
     this.urls.splice(index, 1)
});

Copy after login

4, some

If the match is successful, return true and jump out of the some loop

del(row){
    this.$confirm("确定要删除吗？", "删除").then(action=>{
      this.urls.some((item, i) =>{
      if(item.name == row.name){
       this.urls.splice(i, 1)
       return true;
      }
     }) 
  });
}

Copy after login

5. In the above example, in Store a fixed array in a vue data, traverse the array, implement search function, delete function

In el-table: bind a method in data, and perform fixed array urls in the method Traverse and return a new array to implement the search function

<template>
  <div>
   <label style="float: left;">
   搜索关键字：
   <input type="text" class="form-control" v-model="keyword">
  </label>
    <el-table :data="search(keyword)" size="small" :stripe="true" :border="true" @select="select" @select-all="select">
      <el-table-column type="selection"></el-table-column>
      <el-table-column type="index"></el-table-column>
      <el-table-column label="网站名" prop="name" width="200">
        <template slot-scope="slot">
          <a href="slot.row.url" target="_blank">{{slot.row.name}}</a>
        </template>
      </el-table-column>
      <el-table-column label="网址" prop="url"></el-table-column>
      <el-table-column label="类型" prop="type" width="50"></el-table-column>
      <el-table-column label="国家" prop="country" width="50"></el-table-column>
      <el-table-column label="操作" width="50">
        <template slot-scope="slot">
          <el-button size="mini" type="text" icon="el-icon-delete" @click="del(slot.row)"></el-button>
        </template>
      </el-table-column>
    </el-table>
    <el-divider content-position="left">表格操作</el-divider>
    <el-button @click="batchDelete" type="danger" icon="el-icon-delete" size="small">批量删除</el-button>
  </div>
</template>
<script>
  export default {
    data() {
      return {
    keyword:&#39;&#39;,
        selections: [],
        urls: [{
            name: "新浪",
            url: "http://www.sina.com",
            type: "资讯",
            country: "中国"
          },
          {
            name: "腾讯",
            url: "http://www.tencent.com",
            type: "聊天",
            country: "中国"
          },
          {
            name: "谷歌",
            url: "http://www.google.com",
            type: "资讯",
            country: "美国"
          },
          {
            name: "韬睿",
            url: "http://www.51i-star.com",
            type: "教育",
            country: "中国"
          }
        ]
      };
    },
    methods: {
      del(row){
        this.$confirm("确定要删除吗？", "删除").then(action=>{
     /* this.urls.some((item, i) =>{
      if(item.name == row.name){
       this.urls.splice(i, 1)
       return true;
      }
     }) */
     var index = this.urls.findIndex(item =>{
      if(item.name == row.name){
       return true;
      }
     })
     this.urls.splice(index, 1)
        });
      },
      select(selections, row) {
        this.selections = selections;
      },
      batchDelete() {
        this.$confirm("确定要删除吗？", "删除")
          .then(action => {
            for (var i = this.urls.length - 1; i >= 0; i--) {
              for (var j = this.selections.length - 1; j >= 0; j--) {
                if (this.urls[i].name == this.selections[j].name) {
                  this.urls.splice(i, 1);
                  break;
                }
              }
            }
          })
          .catch(error => {
            alert(error);
            this.$message(&#39;删除取消&#39;);
          });
      },
   search(keyword){
    /* var newList = []
    this.urls.forEach(item =>{
     if(item.name.indexOf(keyword) != -1){
      newList.push(item)
     }
    })
    return newList */
    return this.urls.filter(item =>{
     if(item.name.includes(keyword)){
      return item
     }
    })
   }
    }
  }
</script>
<style>
</style>

Copy after login

6. The rendering is

How vue.js traverses an array

Related free learning recommendations:
javascript(video)

The above is the detailed content of How vue.js traverses an array. For more information, please follow other related articles on the PHP Chinese website!