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用Vue的三种方法实现加减乘除运算

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"

<body>
        <div id="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

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}} <br>

第二种 watch(侦听器)方法:

<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>

第三种methods方法:

<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}}

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

<script>
            const vm = new Vue({
                el: "#app")}
</script>

然后为每个input标签和select标签设置对应的data属性

data: {
                    num1:0,
                    num2:0,
                    sign:"+",
                    
                    num3:0,
                    num4:0,
                    sign1:"+",
                    res1:"0",
                    
                    num5:0,
                    num6:0,
                    sign2:"+",
                    res2:"0"
                }

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:

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;
                        }
                    }
                },

第二种 watch(侦听器)方法:

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;
                        }
                    }
                }

第三种methods方法:

 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);
                        }
                    }
                },
               

把写的3种方法分别绑定对应的input标签和select标签

最后让其得出结果:

分别是:(1)

结果是:{{num1}}{{sign}}{{num2}}={{res}}

(2)

结果是:{{num3}}{{sign1}}{{num4}}={{res1}}

(3)

结果是:{{num5}}{{sign2}}{{num6}}={{res2}}

然后运行

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:"+",
                    
                    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>

效果图:


本文转载自: https://blog.csdn.net/2302_77154755/article/details/129913730
版权归原作者 香菜.. 所有, 如有侵权,请联系我们删除。

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