Vue中遍歷數(shù)組的新方法實(shí)例詳解

來(lái)源：懂視網(wǎng) 責(zé)編：小采時(shí)間：2020-11-27 21:53:28

Vue中遍歷數(shù)組的新方法實(shí)例詳解

Vue中遍歷數(shù)組的新方法實(shí)例詳解:1、foreach foreach循環(huán)對(duì)不能使用return來(lái)停止循環(huán) search(keyword){ var newList = [] this.urls.forEach(item =>{ if(item.name.indexOf(keyword) != -1){ newList.push(item) } }) return ne

推薦度：

點(diǎn)擊下載本文 文檔為doc格式

導(dǎo)讀Vue中遍歷數(shù)組的新方法實(shí)例詳解:1、foreach foreach循環(huán)對(duì)不能使用return來(lái)停止循環(huán) search(keyword){ var newList = [] this.urls.forEach(item =>{ if(item.name.indexOf(keyword) != -1){ newList.push(item) } }) return ne

1、foreach

　　foreach循環(huán)對(duì)不能使用return來(lái)停止循環(huán)

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

2、filter

　　item對(duì)象就是遍歷數(shù)組中的一個(gè)元素，includes是es6中的新方法，在search方法中直接返回新數(shù)組

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

3、findIndex

　　返回true后index就可以獲取到匹配的元素在進(jìn)行刪除

del(row){
 this.$confirm("確定要?jiǎng)h除嗎？", "刪除").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的循環(huán)

del(row){
 this.$confirm("確定要?jiǎng)h除嗎？", "刪除").then(action=>{
 this.urls.some((item, i) =>{
 if(item.name == row.name){
 this.urls.splice(i, 1)
 return true;
 }
 }) 
 });
}

5、上例子，在一個(gè)vue的data中存入一個(gè)固定的數(shù)組，對(duì)數(shù)組進(jìn)行遍歷，實(shí)現(xiàn)搜索功能，刪除功能

　　在el-table中 :data中綁定一個(gè)方法，方法中對(duì)固定的數(shù)組urls進(jìn)行遍歷，返回一個(gè)新的數(shù)組實(shí)現(xiàn)搜索功能

<template>
 <div>
 <label style="float: left;">
 搜索關(guān)鍵字：
 <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="網(wǎng)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="網(wǎng)址" prop="url"></el-table-column>
 <el-table-column label="類(lèi)型" prop="type" width="50"></el-table-column>
 <el-table-column label="國(guó)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">批量刪除</el-button>
 </div>
</template>
<script>
 export default {
 data() {
 return {
 keyword:'',
 selections: [],
 urls: [{
 name: "新浪",
 url: "http://www.sina.com",
 type: "資訊",
 country: "中國(guó)"
 },
 {
 name: "騰訊",
 url: "http://www.tencent.com",
 type: "聊天",
 country: "中國(guó)"
 },
 {
 name: "谷歌",
 url: "http://www.google.com",
 type: "資訊",
 country: "美國(guó)"
 },
 {
 name: "韜睿",
 url: "http://www.51i-star.com",
 type: "教育",
 country: "中國(guó)"
 }
 ]
 };
 },
 methods: {
 del(row){
 this.$confirm("確定要?jiǎng)h除嗎？", "刪除").then(action=>{
 /* this.urls.some((item, i) =>{
 if(item.name == row.name){
 this.urls.splice(i, 1)
 return true;
 }
 }) */
 var index = this.urls.findIndex(item =>{
 if(item.name == row.name){
 return true;
 }
 })
 this.urls.splice(index, 1)
 });
 },
 select(selections, row) {
 this.selections = selections;
 },
 batchDelete() {
 this.$confirm("確定要?jiǎng)h除嗎？", "刪除")
 .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('刪除取消');
 });
 },
 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、效果圖為