|
|
@@ -0,0 +1,49 @@
|
|
|
+<!DOCTYPE html>
|
|
|
+<html lang="en">
|
|
|
+<head>
|
|
|
+ <meta charset="UTF-8">
|
|
|
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
|
+ <title>Document</title>
|
|
|
+ <script src="./js/vue.js"></script>
|
|
|
+</head>
|
|
|
+<body>
|
|
|
+ <div id="app">
|
|
|
+ <h1>商品单价：{{price}}</h1>
|
|
|
+ <div>购买数量：<input type="number" v-model="num"></div>
|
|
|
+ <h1>{{msg}}</h1>
|
|
|
+ <h1>商品总价：{{totalPrice}}</h1>
|
|
|
+ <h1>会员9折后价格：{{memberPrice}}</h1>
|
|
|
+ </div>
|
|
|
+ <script>
|
|
|
+ new Vue({
|
|
|
+ el: '#app',
|
|
|
+ data: {
|
|
|
+ price:200,
|
|
|
+ num:0,
|
|
|
+ msg:"还剩余10件"
|
|
|
+ },
|
|
|
+ computed:{
|
|
|
+ totalPrice(){
|
|
|
+ return this.price*this.num;
|
|
|
+ },
|
|
|
+ memberPrice(){
|
|
|
+ return this.totalPrice*0.9;
|
|
|
+ }
|
|
|
+
|
|
|
+ },
|
|
|
+ watch:{
|
|
|
+ num(newVal,oldVal){
|
|
|
+ if(newVal<0){
|
|
|
+ this.num = 0;
|
|
|
+ }else if(newVal>10){
|
|
|
+ this.msg= "购买数量不能超过10件";
|
|
|
+ // this.num = 10;
|
|
|
+ }else{
|
|
|
+ this.msg="还剩余"+(10-newVal)+"件"
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ })
|
|
|
+ </script>
|
|
|
+</body>
|
|
|
+</html>
|
