TypeScript/Angular 2 - 在另一个函数完成后调用一个函数
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/40486765/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
TypeScript/Angular 2 - call a function after another completes
提问by Roka545
I have two functions that I would like to call, but I only want to call the second one after the first one completes. How do I go about doing that?
我有两个要调用的函数，但我只想在第一个函数完成后调用第二个函数。我该怎么做？
Firstfunction:
第一个功能：
getDirectorySubfolders(node: any) {
console.log('Home:getDirectorySubfolders() entered...');
this._sdiService.getDirectoriesAtPath("Desktop")
.subscribe(res => {
this.nodeChildren = res;
});
}
Secondfunction:
第二个功能：
getChildren(node: any) {
console.log('Home:getChildren entered..');
return new Promise((resolve, reject) =>
{
setTimeout(() => resolve(this.nodeChildren.map((c) =>
{
return Object.assign({}, c, {});
})), 1000);
});
}
回答by Stefan Svrkota
There are two simple ways to call your second function after first one is finished - you can do it under this.nodeChildren = res;or use finish parameter ():
有两种简单的方法可以在第一个函数完成后调用第二个函数 - 您可以在this.nodeChildren = res;完成参数下或使用完成参数()：
getDirectorySubfolders(node: any) {
console.log('Home:getDirectorySubfolders() entered...');
this._sdiService.getDirectoriesAtPath("Desktop")
.subscribe(
res => {
this.nodeChildren = res;
this.getChildren(); <-- here
},
err => {
console.log(err);
},
() => {
this.getChildren(); <-- or here
});
}
When you call getDirectorySubfolders()function, getChildren()will be called after completion of getDirectorySubfolders(). Keep in mind that if you use finish parameter, the function will get called even if error occurs.
调用getDirectorySubfolders()函数时，getChildren()会在完成后调用 getDirectorySubfolders()。请记住，如果您使用完成参数，即使发生错误，该函数也会被调用。
