用Vue的三种方法实现加减乘除运算
admin 阅读: 2024-03-28
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js插件:vue.js
教程:
首先在工具内引入vue.js
- <head>
- <meta charset="utf-8" />
- <script src="js/vue.js"></script>
- </head>
然后在body里面创建一个div并设置id,我这里给id命名为"app"
在id命名为"app"的div内使用input标签和select标签来设置运算框
然后用 methods方法 computed方法 watch(侦听器)方法 做出3种不同的加减乘除运算
第一种computed方法:
- <input type="text" placeholder="输入第一个数" v-model.number="num1">
- <select v-model="sign">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num2"> <br>
- 结果是:{{num1}}{{sign}}{{num2}}={{res}}
接下来我们在id为"app"的div下面或者body的下面创建一个script,定义一个Vue方法并且绑定id为"app"的div
然后为每个input标签和select标签设置对应的data属性
并且写入方法computed:
- <script>
- const vm = new Vue({
- el: "#app",
- data: {
- num1:0,
- num2:0,
- sign:"+",
- res:0
- },
- computed:{
- res(){
- if(this.sign === "+") {
- return this.num1 + this.num2;
- } else if(this.sign === "-") {
- return this.num1 - this.num2;
- } else if(this.sign === "*") {
- return this.num1 * this.num2;
- } else if(this.sign === "/"){
- return this.num1 / this.num2;
- }
- }
- },
- )}
- </script>
第二种 watch(侦听器)方法:
然后在body里面创建一个div并设置id,我这里给id命名为"app"
在id命名为"app"的div内使用input标签和select标签来设置运算框
- <input type="text" placeholder="输入第一个数" v-model.number="num3">
- <select v-model="sign1">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num4"> <br>
- 结果是:{{res}} <br>
- <script>
- const vm = new Vue({
- el: "#app",
- data: {
- num1:0,
- num2:0,
- sign:"+",
- res:0
- }, watch:{
- num1(val){
- if(this.sign === "+") {
- this.res = val + this.num2;
- } else if(this.sign === "-") {
- this.res = val - this.num2;
- } else if(this.sign1 === "*") {
- this.res = val * this.num2;
- } else if(this.sign1 === "/"){
- this.res = val / this.num2;
- }
- },
- num2(val){
- if(this.sign === "+") {
- this.res = this.num1 + val;
- } else if(this.sign1 === "-") {
- this.res = this.num1 - val;
- } else if(this.sign1 === "*") {
- this.res = this.num1 * val;
- } else if(this.sign1 === "/"){
- this.res = this.num1 / val;
- }
- },
- sign(val){
- if(val === "+") {
- this.res = this.num1 + this.num2;
- } else if(val === "-") {
- this.res = this.num1 - this.num2;
- } else if(val === "*") {
- this.res = this.num1 * this.num2;
- } else if(val === "/"){
- this.res = this.num1 / this.num2;
- }
- }
- }
- )}
- </script>
第三种methods方法:
在body里面创建一个div并设置id,我这里给id命名为"app"
在id命名为"app"的div内使用input标签和select标签来设置运算框
- <input type="text" placeholder="输入第一个数" v-model.number="num5" @change="change">
- <select v-model="sign2" @change="change">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num6" @change="change"> <br>
- 结果是:{{num5}}{{sign2}}{{num6}}={{res}}
- <script>
- const vm = new Vue({
- el: "#app",
- data: {
- num1:0,
- num2:0,
- sign:"+",
- res:0
- },methods:{
- change(){
- if(this.sign2 === "+") {
- this.res = this.num1 + this.num2;
- } else if(this.sign === "-") {
- this.res = this.num1 - this.num2;
- } else if(this.sign === "*") {
- this.res = this.num1 * this.num2;
- } else if(this.sign === "/"){
- this.res = parseInt(this.num1) / parseInt(this.num2);
- }
- }
- },
- )}
- </script>
然后运行
效果图
源代码:
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8" />
- <script src="js/vue.js"></script>
- </head>
- <body>
- <div id="app">
- <input type="text" placeholder="输入第一个数" v-model.number="num1">
- <select v-model="sign">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num2"> <br>
- 结果是:{{num1}}{{sign}}{{num2}}={{res}} <br>
- <input type="text" placeholder="输入第一个数" v-model.number="num3">
- <select v-model="sign1">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num4"> <br>
- 结果是:{{num3}}{{sign1}}{{num4}}={{res1}} <br>
- <input type="text" placeholder="输入第一个数" v-model.number="num5" @change="change">
- <select v-model="sign2" @change="change">
- <option>+</option>
- <option>-</option>
- <option>*</option>
- <option>/</option>
- </select>
- <input type="text" placeholder="输入第二个数" v-model.number="num6" @change="change"> <br>
- 结果是:{{num5}}{{sign2}}{{num6}}={{res2}}
- </div>
- <script>
- const vm = new Vue({
- el: "#app",
- data: {
- num1:0,
- num2:0,
- sign:"+",
- res:"0",
- num3:0,
- num4:0,
- sign1:"+",
- res1:"0",
- num5:0,
- num6:0,
- sign2:"+",
- res2:"0"
- },
- methods:{
- change(){
- if(this.sign2 === "+") {
- this.res2 = this.num5 + this.num6;
- } else if(this.sign2 === "-") {
- this.res2 = this.num5 - this.num6;
- } else if(this.sign2 === "*") {
- this.res2 = this.num5 * this.num6;
- } else if(this.sign2 === "/"){
- this.res2 = parseInt(this.num5) / parseInt(this.num6);
- }
- }
- },
- computed:{
- res(){
- if(this.sign === "+") {
- return this.num1 + this.num2;
- } else if(this.sign === "-") {
- return this.num1 - this.num2;
- } else if(this.sign === "*") {
- return this.num1 * this.num2;
- } else if(this.sign === "/"){
- return this.num1 / this.num2;
- }
- }
- },
- watch:{
- num3(val){
- if(this.sign1 === "+") {
- this.res1 = val + this.num4;
- } else if(this.sign1 === "-") {
- this.res1 = val - this.num4;
- } else if(this.sign1 === "*") {
- this.res1 = val * this.num4;
- } else if(this.sign1 === "/"){
- this.res1 = val / this.num4;
- }
- },
- num4(val){
- if(this.sign1 === "+") {
- this.res1 = this.num3 + val;
- } else if(this.sign1 === "-") {
- this.res1 = this.num3 - val;
- } else if(this.sign1 === "*") {
- this.res1 = this.num3 * val;
- } else if(this.sign1 === "/"){
- this.res1 = this.num3 / val;
- }
- },
- sign1(val){
- if(val === "+") {
- this.res1 = this.num3 + this.num4;
- } else if(val === "-") {
- this.res1 = this.num3 - this.num4;
- } else if(val === "*") {
- this.res1 = this.num3 * this.num4;
- } else if(val === "/"){
- this.res1 = this.num3 / this.num4;
- }
- }
- }
- })
- </script>
- </body>
- </html>
- ————————————————
- 版权声明:本文为CSDN博主「hu15137376135」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
- 原文链接:https://blog.csdn.net/hu15137376135/article/details/129914536
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