javascript 条件为真时停止函数
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Stop function if condition is true
提问by John Smith
I use the Array map()Method to check each element in an Array and if the condition in the if clausel is true i call another function.
我使用数组map()方法检查数组中的每个元素，如果 if 子句中的条件为真，我将调用另一个函数。
$.map(data['icd'], function (field, i) {
if(field.nummer == search){
Diagnose.single(field.id);
};
});
Now my problem is that i want to stop the mapmethod if a element fullfills the if condition. Because i noticed that when i have for example 6 elements that fullfill the condition the function Diagnose.single(field.id);is called 6 times instead of once!
现在我的问题是，map如果元素满足 if 条件，我想停止该方法。因为我注意到当我有例如 6 个元素满足条件时，该函数Diagnose.single(field.id);被调用 6 次而不是一次！
I tried:
我试过：
$.map(data['icd'], function (field, i) {
if(field.nummer == search){
Diagnose.single(field.id);
return true;
};
});
But this didnt worked! What can i do instead? Thanks
但这没有用！我可以做什么？谢谢
回答by dfsq
Use simple for-loop with break statement:
使用带有 break 语句的简单 for 循环：
for (var i = 0; i < data['icd'].length; i++) {
if (data['icd'][i].nummer == search){
Diagnose.single(data['icd'][i].id);
break;
};
}
mapis used for different tasks.
map用于不同的任务。
回答by PanJ
If you do not need IE8 support, you can use Array.prototype.some
如果不需要IE8支持，可以使用 Array.prototype.some
data['icd'].some(function (field, i) {
if(field.nummer == search){
Diagnose.single(field.id);
return true;
};
});
回答by ReGdYN
Return false and replace .map with .each
返回 false 并用 .each 替换 .map
$.each(data['icd'], function (field, i) {
if(field.nummer == search){
Diagnose.single(field.id);
// Need to return false, return true will go for a success and still continue.
return false;
};
});
回答by Mottie
I think in your case you want to use the jQuery each function. You can then return falseto break out of the loop
我认为在你的情况下你想使用jQuery each 函数。然后你可以return false跳出循环
$.each(data['icd'], function (field, i) {
if(field.nummer == search){
Diagnose.single(field.id);
return false;
};
});
or even better, use a simple for-loop as @disq shared.
或者甚至更好，使用一个简单的 for 循环作为 @disq 共享。
