65作业

点击的对应的按钮改变颜色

<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #id_back {
            border: 1px solid black;
            height: 200px;
            width: 200px;   
        }
        .c2{
            background-color: red;
        }

        .c3{
            background-color: yellow;
        }

        .c4{
            background-color: blue;
        }
    </style>

</head>

<body>
    <div id="id_back" :class='cls'>
    </div>
    <br>
    <div>
        <button id="id_red" @click="changRed">红色</button>&nbsp;&nbsp;
        <button id="id_yellow" @click="changYel">黄色</button>&nbsp;&nbsp;
        <button id="id_blue" @click="changBlue">蓝色</button>&nbsp;&nbsp;
    </div>
</body>
<script src="js/vue.js"></script>
<script>


    let bac = new Vue({
        el: '#id_back',
        data: {
          cls: 'c1'
        }
    })

    new Vue({
        el: '#id_red',

        methods: {

            changRed() {
                bac.cls = 'c2'
            }
        }
    })
    new Vue({
        el: '#id_yellow',

        methods: {

            changYel() {
                bac.cls = 'c3'
            }
        }
    })
    new Vue({
        el: '#id_blue',

        methods: {

            changBlue() {
                bac.cls = 'c4'
            }
        }
    })
</script>

</html>

点击改变颜色

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #wrap {
            border: 1px solid black;
            height: 200px;
            width: 200px;
        }
    </style>
</head>

<body>
    <div id="wrap" @click='changeColor':style={backgroundColor:color}>
    </div>
</body>
<script src="js/vue.js"></script>
<script> 
    new Vue({
        el:'#wrap',
        data:{
            count:0,
            color:'write',
            color_list:['pink','green','cyan']
        },
        methods:{
            changeColor(){
                // 记录点击次数
                let n = this.count++
                this.color = this.color_list[n % this.color_list.length]

            }
        }
    })
</script>

</html>

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