Vue中遍历数组的新方法实例详解

2019-11-19 11:09:32

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1、foreach

　　foreach循环对不能使用return来停止循环

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

2、filter

　　item对象就是遍历数组中的一个元素，includes是es6中的新方法，在search方法中直接返回新数组

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

3、findIndex

　　返回true后index就可以获取到匹配的元素在进行删除

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)});

4、some

　　如果匹配成功就return true跳出some的循环

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;      }     })   });}

5、上例子，在一个vue的data中存入一个固定的数组，对数组进行遍历，实现搜索功能，删除功能

　　在el-table中 :data中绑定一个方法，方法中对固定的数组urls进行遍历，返回一个新的数组实现搜索功能

<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:'',        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('删除取消');          });      },   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>

6、效果图为