用Vue開發項目有一段時間,在實際項目中遇到一些問題,在里把問題記錄下來,並附上解決方案,給遇到同樣的問題的碼友提供一個解決思路吧:
- 測試部拋出問題一:在Vue1.0路由vue-router中,當點擊菜單一個組件加載出來表格列表,輸入查詢條件查詢,當在單擊這個菜單后表格的數據沒有重置查詢條件和查詢結果.
原因分析:Vue路由在頁面渲染一個組件后加載后,再加載這個組件,組件不會摧毀后在重新生成這個組件,不會重新觸發組件的生命周期中的方法.代碼如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<title>learning vue</title>
</head>
<body>
<div id="app-container">
<ul>
<li v-for="item in $root.list">
<a v-link="{ path: '/lang/' + item.id }">{{ item.name }}{{para}}{{params}}</a>
</li>
</ul>
<router-view :params="params"></router-view>
</div>
<script src="js/vue.js"></script>
<script src="js/vue-router.js"></script>
<script>
Vue.config.debug = true;
Vue.use(VueRouter);
var AppComponent = Vue.extend({
data: function(){
return {
params:111,
list: [
{ id: '10001', name: 'C#', message: 'Hello C#' },
{ id: '10002', name: 'Java', message: 'Hello Java.' },
{ id: '10003', name: 'C++', message: 'Hello C++' },
{ id: '10004', name: 'JavaScript', message: 'Hello JavaScript' }
]
};
}
});
var LangDetailComponent = Vue.extend({
template: `<div><h1>{{ model.name }}</h1><p>{{ model.message }}</p></div>`,
computed: {
model: function(){
var list = this.$root.list;
var id = this.$route.params.id;
for(var i = 0; i < list.length; i++){
if(list[i].id === id){
return list[i];
}
}
}
},
init:function () {
alert("init");
},
created:function () {
alert("created");
},
beforeCompile:function () {
alert("beforeCompile");
},
compiled:function () {
alert("compiled");
},
ready:function () {
alert("ready");
},
attached:function () {
alert("attached")
},
detached:function () {
alert("detached")
},
beforeDestroy:function () {
alert("beforeDestroy")
},
destroyed:function () {
alert("destroyed")
}
});
var router = new VueRouter();
router.map({
'/lang/:id': { component: LangDetailComponent }
});
router.start(AppComponent, '#app-container');
</script>
</body>
</html>
執行效果:
着三個路由都是同一個組件,但點擊其他的時候組件中的所有生命周期的方法都沒有調用,去vue-router的api上看沒有找到重新加載路由的配置配置項.
在實際開發中這個問題在兩個菜單共用一個組件,設置傳參來判斷加載不同的數據的情況下,會出現另一個ready方法不走導致數據顯示不真確.解決思路可以加監聽路由地址觸發ready事件.
而上面的解決方法是用v-if來重新加載組件,代碼如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<title>learning vue</title>
</head>
<body>
<div id="app-container">
<ul>
<li v-for="item in $root.list">
<a href="javascript:void(0)" @click="click(item.path)">{{ item.name }}</a>
</li>
</ul>
<router-view v-if="show"></router-view>
</div>
<script src="js/vue.js"></script>
<script src="js/vue-router.js"></script>
<script>
Vue.config.debug = true;
Vue.use(VueRouter);
var AppComponent = Vue.extend({
data: function(){
return {
show:true,
list: [
{ id: '10001', name: 'C#', message: 'Hello C#',path:"/lan"},
{ id: '10002', name: 'Java', message: 'Hello Java.',path:"/lan1"},
{ id: '10003', name: 'C++', message: 'Hello C++' ,path:"/lan2"},
{ id: '10004', name: 'JavaScript', message: 'Hello JavaScript',path:"/lan3" }
]
};
},
methods:{
click:function (path) {
debugger;
if(window.location.hash.replace("#!","")==path){
this.show=false;
Vue.nextTick(function () {
this.show=true;
}.bind(this))
}else{
this.$router.go({path:path});
}
}
}
});
var LangDetailComponent = Vue.extend({
template: `<div><h1>C#</h1><p>232323</p></div>`,
computed: {
model: function(){
var list = this.$root.list;
var id = this.$route.params.id;
for(var i = 0; i < list.length; i++){
if(list[i].id === id){
return list[i];
}
}
}
},
init:function () {
alert("init");
},
created:function () {
alert("created");
},
beforeCompile:function () {
alert("beforeCompile");
},
compiled:function () {
alert("compiled");
},
ready:function () {
alert("ready");
},
attached:function () {
alert("attached")
},
detached:function () {
alert("detached")
},
beforeDestroy:function () {
alert("beforeDestroy")
},
destroyed:function () {
alert("destroyed")
}
});
var LangDetailComponent1 = Vue.extend({
template: `<div><h1>Java</h1><p>Hello Java.</p></div>`,
computed: {
model: function(){
var list = this.$root.list;
var id = this.$route.params.id;
for(var i = 0; i < list.length; i++){
if(list[i].id === id){
return list[i];
}
}
}
},
init:function () {
alert("init");
},
created:function () {
alert("created");
},
beforeCompile:function () {
alert("beforeCompile");
},
compiled:function () {
alert("compiled");
},
ready:function () {
alert("ready");
},
attached:function () {
alert("attached")
},
detached:function () {
alert("detached")
},
beforeDestroy:function () {
alert("beforeDestroy")
},
destroyed:function () {
alert("destroyed")
}
});
var LangDetailComponent2 = Vue.extend({
template: `<div><h1>C++</h1><p>Hello C++</p></div>`,
computed: {
model: function(){
var list = this.$root.list;
var id = this.$route.params.id;
for(var i = 0; i < list.length; i++){
if(list[i].id === id){
return list[i];
}
}
}
},
init:function () {
alert("init");
},
created:function () {
alert("created");
},
beforeCompile:function () {
alert("beforeCompile");
},
compiled:function () {
alert("compiled");
},
ready:function () {
alert("ready");
},
attached:function () {
alert("attached")
},
detached:function () {
alert("detached")
},
beforeDestroy:function () {
alert("beforeDestroy")
},
destroyed:function () {
alert("destroyed")
}
});
var LangDetailComponent3 = Vue.extend({
template: `<div><h1>JavaScript</h1><p>Hello JavaScript</p></div>`,
computed: {
model: function(){
var list = this.$root.list;
var id = this.$route.params.id;
for(var i = 0; i < list.length; i++){
if(list[i].id === id){
return list[i];
}
}
}
},
init:function () {
alert("init");
},
created:function () {
alert("created");
},
beforeCompile:function () {
alert("beforeCompile");
},
compiled:function () {
alert("compiled");
},
ready:function () {
alert("ready");
},
attached:function () {
alert("attached")
},
detached:function () {
alert("detached")
},
beforeDestroy:function () {
alert("beforeDestroy")
},
destroyed:function () {
alert("destroyed")
}
});
var router = new VueRouter();
router.map({
'/lan': { component: LangDetailComponent },
'/lan1': { component: LangDetailComponent1 },
'/lan2': { component: LangDetailComponent2 },
'/lan3': { component: LangDetailComponent3 }
});
router.start(AppComponent, '#app-container');
</script>
</body>
</html>
效果是:
這樣在點相同的菜單,組件就重新加載,后面想優化每個菜單都加click,菜單很多話對頁面是性能消耗,下篇想用vue能不能用事件委托綁定單擊事件.暫時先寫到這里.
這里在多說一句,Vue的路由是hash路由,所以要回去路由地址可以用 window.location.hash.replace("#!","")來獲取.不知道hash路由的可以百度下,這里就不多說了