<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<style>
.box {
200px;
height: 200px;
background-color: black;
}
.red{
background-color: red;
}
.yel{
background-color: yellow;
}
.blue{
background-color: blue;
}
</style>
</head>
<body>
<div id="d1">
<div :class="['box',{red:is_true,yel:is_true1,blue:is_true2}]" ></div>
<button @click="f1">{{red}}</button>
<button @click="f2">{{yel}}</button>
<button @click="f3">{{blue}}</button>
</div>
</body>
<script src="bootstrap-3.3.7-dist/vue.min.js"></script>
<script>
new Vue({
el:'#d1',
data:{
is_true:false,
is_true1:false,
is_true2:false,
red:'红色',
yel:'黄色',
blue:'蓝色',
},
methods:{
f1(){
this.is_true=1;
this.is_true1=0;
this.is_true2=0;
},
f2(){
this.is_true1=1;
this.is_true=0;
this.is_true2=0;
},
f3(){
this.is_true2=1;
this.is_true1=0;
this.is_true=0;
}
}
});
</script>
</html>
### 作业二：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<style>
.box {
200px;
height: 200px;
background-color: black;
}
.pink{
background-color: pink;
}
.green{
background-color: green;
}
.cyan{
background-color: cyan;
}
</style>
</head>
<body>
<div id="d2">
<div :class="['box',{pink:is_true,green:is_true1,cyan:is_true2}]" @click="f1($event)"></div>
</div>
</body>
<script src="bootstrap-3.3.7-dist/vue.min.js"></script>
<script>
new Vue({
el:'#d2',
data:{
is_true:false,
is_true1:false,
is_true2:false,
},
methods: {
f1(e){
let time=1;
if(e.detail===time){
this.is_true = 1;
this.is_true1 = 0;
this.is_true2 = 0;
console.log(time)
}if(e.detail===time+1){
this.is_true = 0;
this.is_true1 = 1;
this.is_true2 = 0;
}if (e.detail===time+2) {
this.is_true = 0;
this.is_true1 = 0;
this.is_true2 = 1;
}
}
}
})
</script>
</html>