場景描述
某些情況下,開發者可能需要實現頁面間的消息傳遞來獲取數據,例如A頁面跳轉至B頁面后,B頁面發送消息給A頁面,A頁面能夠接收到。此時可以通過消息通道的機制來實現頁面間的相互通信。
實現思路
頁面messageChannel創建了消息通道,並接收消息。跳轉到頁面test,在頁面test通過消息通道發送消息。頁面messageChannel收到消息后通過toast展示出來。
解決方法
頁面messageChannel.ux文件:
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<
template
>
<
div
class
=
"item-container"
>
<
input
type
=
"button"
onclick
=
"creatChannel"
value
=
"創建消息通道"
/>
<
input
type
=
"button"
onclick
=
"routeChannel"
value
=
"跳轉到detail頁面發送消息"
/>
<
input
type
=
"button"
onclick
=
"cancelChannel"
value
=
"關閉消息通道"
/>
</
div
>
</
template
>
<
style
>
.item-container {
margin-bottom: 50px;
flex-direction: column;
justify-content:center;
}
input{
margin-bottom: 70px;
}
</
style
>
<
script
>
import prompt from '@system.prompt'
import router from "@system.router"
var channel;
export default {
data: {
componentName: 'messageChannel'
},
onInit: function () {
this.$page.setTitleBar({text: 'messageChannel'})
},
creatChannel: function () {
channel = new BroadcastChannel('channel1');
prompt.showToast({message: '創建消息通道成功'});
channel.onmessage = function (event) {
console.log(event.data)
prompt.showToast({message: '接受消息:' + event.data});
}
},
routeChannel: function () {
router.push({
uri: '/Test'
});
},
cancelChannel: function () {
channel.close();
prompt.showToast({message: '關閉消息通道成功'});
}
}
</
script
>
|
頁面test.ux文件:
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|
<
template
>
<
div
class
=
"item-container"
>
<
input
type
=
"button"
onclick
=
"postChannel"
value
=
"發送消息"
/>
</
div
>
</
template
>
<
style
>
.item-container {
margin-bottom: 50px;
flex-direction: column;
justify-content:center;
}
</
style
>
<
script
>
export default {
data: {
componentName: 'detail',
},
onInit: function () {
this.$page.setTitleBar({text: 'detail'})
},
postChannel: function () {
var channel = new BroadcastChannel('channel1');
channel.postMessage("hello world");
}
}
</
script
>
|
更多參考
快應用文檔參考:
https://developer.huawei.com/consumer/cn/doc/development/quickApp-References/quickapp-script
原文鏈接:developer.huawei.com/consumer/cn…
原作者:Mayism