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How to implement the same interview question component using angular, react and vue

亚连Original: 2018-06-05 17:05:011627browse

eact, angular, and vue are all three frameworks that have become popular recently. The following article mainly introduces you to the relevant information about using angular, react, and vue to implement the same interview question components. The article introduces it through sample code. For details, friends in need can refer to it.

Preface

This article mainly introduces to you the relevant content about angular, react and vue implementing the same interview question components, share it For your reference and study, I won’t say much more below, let’s take a look at the detailed introduction.

Interview question requirements are as follows

1. angular:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="angular-1.4.6.js"></script>
<style>
.del{
text-decoration: line-through;
color: red;
}
.in1{
margin-left: 40px;
}
</style>
</head>
<body ng-app="app" ng-controller="my-ctrl">
<input type="text" ng-model="val">
<button ng-click="add()">添加</button>
<ul>
<li ng-repeat="(key,item) in items" ng-show="flag||!items[key].labs" ng-class={true:&#39;del&#39;,false:&#39;unselected&#39;}[items[key].labs]><input type="checkbox" ng-click="labe()" ng-model="lab">{{item.text}}<input type="button" value="删除" ng-click="delate()" class="in1"></li>
</ul>
<button type="button" ng-click="showall()">已完成开关显示</button>
<button type="button" ng-click="delateall()">清除已完成</button>
</body>
<script type="text/javascript">
var myapp = angular.module("app",[]);
myapp.controller("my-ctrl",function($scope){
$scope.items = [];
$scope.flag = 1;
$scope.add=function(){
$scope.items.unshift({text:$scope.val,labs:0}); 
}
$scope.delate=function(){ 
$scope.items.splice(this.$index,1);
}
$scope.labe=function(){ 
$scope.items[this.$index].labs=this.lab;
}
$scope.showall=function(){
if($scope.flag == 0){
$scope.flag = 1;
}
else{
$scope.flag = 0;
}
}
//倒序删除数组元素

//这里必须使用倒叙删除数组因为angular数据双向绑定，正序的话会导致数据随时更新影响for循环

$scope.delateall=function(){ 
for(var i=$scope.items.length-1;i>=0;i--){
if($scope.items[i].labs==true){
$scope.items.splice(i,1);
}
}
}

//delateall除了这种方式书写还有另外一种正序删除的方式

//$scope.delateall=function(){
//$scope.delall=[];
//for(var i=0;i<$scope.items.length;i++){
//if($scope.items[i].labs == true){
//console.log(i);
//$scope.delall.push(i);
//} 
//}
//console.dir($scope.delall);
//for(var j=0;j<$scope.delall.length;j++){
//if(j==0){
//$scope.items.splice($scope.delall[j],1); 
//}
//else{
//$scope.items.splice(($scope.delall[j]-j),1); 
//}
//}
//console.dir($scope.items);
//}
})
</script>
</html>

2、react:

import React, { Component } from &#39;react&#39;;
import &#39;./App.css&#39;;

class App extends Component {
constructor(){
super();
this.state={
alll:[],
values:&#39;&#39;,
flag:true
}
}
add(e){
let arr1 = this.state.alll;
arr1.push({msg:this.state.values,check1:false});
this.setState({
alll:arr1
})
console.log(this.state.alll);
}
change(e){
this.setState({
values:e.nativeEvent.target.value
})

}
delate(e){
let index1 = e.target.parentNode.id;
let arr1 = [];
for(var i =0;i<this.state.alll.length;i++){
arr1.push(JSON.parse(JSON.stringify(this.state.alll[i])));
}
arr1.splice(index1,1);
console.log(arr1);
this.setState(
{alll: arr1},
() =>{
alert(1);
console.log(this.state.alll)
}
)
}
checktoggle(e){
let index1 = e.target.parentNode.id;
let arr1 = this.state.alll;
arr1[index1].check1 = !arr1[index1].check1;
this.setState({
alll:arr1
})
console.log(this.state.alll);
}
hideandshow(e){
this.setState({
flag : !this.state.flag
})
}
removeAll(){
let arr1 = [];
for(var i =0;i<this.state.alll.length;i++){
arr1.push(JSON.parse(JSON.stringify(this.state.alll[i])));
}
for(let i = arr1.length-1;i>-1;i--){
console.log(i);
if(arr1[i].check1 === true){
arr1.splice(i,1);
}
}
this.setState({
alll:arr1
})
console.log(this.state.alll);
}
render() {
var result = [];
for(let i = 0;i<this.state.alll.length;i++){
result.push(<p key={i} id={i} className={this.state.flag||!this.state.alll[i].check1?&#39;dis1&#39;:&#39;disn&#39;}><input type="checkbox" onClick={this.checktoggle.bind(this)} checked={this.state.alll[i].check1} name={i} /><span className={this.state.alll[i].check1?&#39;del1&#39;:&#39;&#39;}>{this.state.alll[i].msg}</span><input type="button" value="删除" onClick={this.delate.bind(this)} className="in" /></p>)
}
return (
<p className="App">
{this.state.values}

<input type="text" placeholder="请添加事件" className="in" onChange={this.change.bind(this)} /> 
<input type="button" value="添加" onClick={this.add.bind(this)}/>
<ul ref="ul1">

{result}

</ul>
<input type="button" value="已完成显示开关" className="in" onClick={this.hideandshow.bind(this)}/>
<input type="button" value="清除已完成" className="in" onClick={this.removeAll.bind(this)}/>
</p>
);
}
}
export default App;
//使用react写时，数组的复制有使用的不标准，正确的深度复制应该转化为字符串以后再复制，类似于代码中removeAll复制的方式。但是在当前实例中浅复制也可以完成功能。

3、vue2.0：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="vue2.0.js"></script>
<style>
.in{
margin:20px; 
}
.cl1{
text-decoration: line-through;
color: red;
}
.cl2{

}
</style>
</head>
<body>
<p id="app">
<input type="text" placeholder="请添加事件" class="in" v-model="msg"/>
<input type="button" value="添加" @click="add()"/>
<p v-for="(item,index) in alll" :key="index" :id="index" v-if="flag1||!item.check1">
<input type="checkbox" class="in" @click="clickChecked" :checked="item.check1"/>
<span>{{item.msg1}}</span>
<input type="button" value="删除" class="in" @click="delate"/>
</p>
<p>
<input type="button" value="已完成显示开关" class="in" @click="showAll"/>
<input type="button" value="清除已完成" class="in" @click="removeAll($event)"/>
</p>
</p>
<script>
new Vue({
el:&#39;#app&#39;,
data:{
msg:&#39;&#39;,
alll:[],
flag1:true,

},
methods:{
add(){
this.alll.unshift({msg1:this.msg,check1:false});
console.log(this.alll)
},
delate(e){
let index1 = e.target.parentNode.id;
this.alll.splice(index1,1);
console.log(this.alll);
},
clickChecked(e){
let index1 = e.target.parentNode.id;
this.alll[index1].check1 = !this.alll[index1].check1;
},
showAll(){
this.flag1 = !this.flag1;
},
removeAll(){
console.log(this.alll);
for(var i =this.alll.length-1;i>-1;i--){
if(this.alll[i].check1==true){
this.alll.splice(i,1);
}
}
// for(let i = 0;i<this.alll.length;i++){
// if(this.alll[i].check1==true){
// this.alll.splice(i,1);
// }
// }//由于vue的数据双向绑定，从前到后遍历删除存在错误。
}
}
})
</script>
</body>
</html>

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

vue2.0 computed Example of calculating the accumulated value after list loop

Data grouping of v-for in Vue Example

Using v-for in vue to traverse a two-dimensional array

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