如何退出 javascript 函数？
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How can I exit from a javascript function?
提问by Samantha J T Star
I have the following:
我有以下几点：
function refreshGrid(entity) {
var store = window.localStorage;
var partitionKey;
...
...
I would like to exit from this function if an "if" condition is met. How can I exit? Can I just say break, exit or return?
如果满足“if”条件，我想退出此函数。我怎样才能退出？我可以说休息、退出或返回吗？
回答by Florian Margaine
if ( condition ) {
return;
}
The returnexits the function returning undefined.
在return退出函数返回undefined。
The exitstatement doesn't exist in javascript.
该exit语句在 javascript 中不存在。
The breakstatement allows you to exit a loop, not a function. For example:
该break语句允许您退出循环，而不是函数。例如：
var i = 0;
while ( i < 10 ) {
i++;
if ( i === 5 ) {
break;
}
}
This also works with the forand the switchloops.
这也适用for于switch循环和循环。
回答by Adil
Use return statement anywhere you want to exit from function.
在要退出函数的任何地方使用 return 语句。
if(somecondtion)
return;
if(somecondtion)
return false;
回答by thecodeparadox
you can use
您可以使用
return false;or return;within your condition.
return false;或return;在您的条件下。
function refreshGrid(entity) {
var store = window.localStorage;
var partitionKey;
....
if(some_condition) {
return false;
}
}
回答by Sam T
Use this when if satisfies
当满足时使用这个
do
做
return true;
回答by Yosep Kim
You should use return as in:
您应该使用 return ：
function refreshGrid(entity) {
var store = window.localStorage;
var partitionKey;
if (exit) {
return;
}
回答by Rodrigo E. Principe
I had the same problem in Google App Scripts, and solved it like the rest said, but with a little more..
我在 Google App Scripts 中遇到了同样的问题，并像其他人所说的那样解决了它，但还有一点..
function refreshGrid(entity) {
var store = window.localStorage;
var partitionKey;
if (condition) {
return Browser.msgBox("something");
}
}
This way you not only exit the function, but show a message saying why it stopped. Hope it helps.
通过这种方式，您不仅可以退出函数，还可以显示一条消息，说明它为什么停止。希望能帮助到你。
