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超轻量级php框架startmvc

Vue中遍历数组的新方法实例详解

更新时间:2020-09-05 02:54:01 作者:startmvc
1、foreach  foreach循环对不能使用return来停止循环search(keyword){varnewList=[]this.urls.forEach(item=&g

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

总结

以上所述是小编给大家介绍的Vue中遍历数组的新方法实例详解,希望对大家有所帮助,如果大家有任何疑问欢迎给我留言,小编会及时回复大家的!

vue 遍历数组