2019-10-19
- 监听路由
watch: {
$route(newRoute,oldRoute) {
// todo
}
}
//实例
let vm = new Vue({
el: "#app",
data: {},
router,
watch: {
'$route.path': function (newVal, oldVal) {
if (newVal === '/login') {
console.log('欢迎进入登录页面');
}
if (newVal === '/register') {
console.log('欢迎进入注册页面');
}
}
}
})
watch监听路由.png
- 深层监听
watch:{
childrens:{
handler:function(val,oldval){
console.log(val.name)
},
deep:true//对象内部的属性监听，也叫深度监听
},
}
- 立即执行
poster: {
handler(newName, oldName) {
// ...
},
immediate: true
}
Vue.js 简单购物车-(例子)
//html文件----------------------------------------------------------------------------------------------------------------------
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<div id="app">
<table>
<tr>
<th>序号</th>
<th>商品名称</th>
<th>商品价格</th>
<th>购买数量</th>
<th>操作</th>
</tr>
<tr v-for="iphone in Ip_Json">
<td>{{ iphone.id }}</td>
<td>{{ iphone.name }}</td>
<td>{{ iphone.price }}</td>
<td>
<button v-bind:disabled="iphone.count === 0" v-on:click="iphone.count-=1">-</button>
{{ iphone.count }}
<button v-on:click="iphone.count+=1">+</button>
</td>
<td>
<button v-on:click="iphone.count=0">移除</button>
</td>
</tr>
</table>
总价：${{totalPrice()}}
</div>
//css文件----------------------------------------------------------------------------------------------------------------------
table {
border: 1px solid black;
}
table {
width: 100%;
}
th {
height: 50px;
}
th, td {
border-bottom: 1px solid #ddd;
}
//js文件
var app = new Vue({
el: '#app',
data: {
Ip_Json: [{
id: 1,
name: 'iphone 8',
price: 5099,
count: 1
},
{
id: 2,
name: 'iphone xs',
price: 8699,
count: 1
},
{
id: 3,
name: 'iphone xr',
price: 6499,
count: 1
}]
},
methods:{
totalPrice : function(){
var totalP = 0;
for (var i = 0,len = this.Ip_Json.length;i<len;i++) {
totalP+=this.Ip_Json[i].price*this.Ip_Json[i].count;
}
return totalP;
}
}
})
