typescript 离子 2 : 设置间隔
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Ionic 2 : Set interval
提问by V. Pivet
I try to set an interval in a .ts file but I don't understand how to use a function in the same file in the interval.
我尝试在 .ts 文件中设置间隔,但我不明白如何在间隔中的同一文件中使用函数。
To explain :
解释 :
My interval setting :
我的间隔设置:
this.task = setInterval(function () {
this.refreshData();
}, 300);
And my function in the same ts file :
我在同一个 ts 文件中的功能:
refreshData() : void{
console.log('update...');
}
When I run on my device, I have this error :
当我在我的设备上运行时,出现以下错误:
04-19 10:38:57.535 21374-21374/com.ionicframework.app722890 I/chromium: [INFO:CONSOLE(79432)] "TypeError: this.refreshData is not a function
at file:///android_asset/www/build/main.js:10987:18
at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:10284)
at Object.onInvokeTask (file:///android_asset/www/build/main.js:39626:37)
at t.invokeTask (file:///android_asset/www/build/polyfills.js:3:10220)
at e.runTask (file:///android_asset/www/build/polyfills.js:3:7637)
at invoke (file:///android_asset/www/build/polyfills.js:3:11397)
at e.args.(anonymous function) (file:///android_asset/www/build/polyfills.js:2:30193)", source: file:///android_asset/www/build/main.js (79432)
I try this way but I doesn't work :
我尝试这种方式,但我不工作:
this.task = setInterval(this.refreshData(), 300);
This call my function only one time.
这仅调用我的函数一次。
Someone have an idea ?
有人有想法吗?
回答by Tiep Phan
use arrow function
使用箭头函数
this.task = setInterval(() => {
this.refreshData();
}, 300);
or store context like this
或像这样存储上下文
let self = this;
this.task = setInterval(function () {
self.refreshData();
}, 300);
or using bind
或使用 bind
this.task = setInterval((function () {
this.refreshData();
}).bind(this), 300);
if only one function call:
如果只有一个函数调用:
this.task = setInterval(this.refreshData.bind(this), 300);
you could learn more about this with https://github.com/getify/You-Dont-Know-JS/tree/1st-ed/this%20%26%20object%20prototypes/ch1.md
您可以通过https://github.com/getify/You-Dont-Know-JS/tree/1st-ed/this%20%26%20object%20prototypes/ch1.md了解更多相关信息
回答by user3563484
You should use setInterval() with => arrow, as I mentioned below
你应该使用 setInterval() 和 => 箭头,正如我在下面提到的
setInterval(() => {
console.log('timer');
//you can call function here
},5000);
100% working.
100% 工作。
回答by flowest
try this:
试试这个:
setInterval(this.refreshData, 300);
回答by Sagar Kulkarni
I copy pasted your code in my app.
我将您的代码复制粘贴到我的应用中。
This worked:
这有效:
this.task = setInterval( () => {
this.refreshData();
}, 300);