javascript Uncaught SyntaxError: Unexpected token = in Google Chrome
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Uncaught SyntaxError: Unexpected token = in Google Chrome
提问by devo
I have a javascript function which accept an optional parameter. This works fine in Firefox, but in Google Chromeit shows:-
我有一个 javascript 函数，它接受一个可选参数。这在 中工作正常Firefox，但Google Chrome其中显示：-
Uncaught SyntaxError: Unexpected token =
My Code,
我的代码，
function errorNotification(text = "Something went wrong!") {
$.pnotify({
title: 'Error',
text: text,
type: 'error'
});
}
I have seen lot of similar questions but I can't realize my problem.
我看过很多类似的问题，但我无法意识到我的问题。
回答by Arun P Johny
You are using a default parameterfeature which is supported only by Firefox now.
您正在使用默认参数功能，该功能现在仅受 Firefox 支持。
function errorNotification(text) {
text = text || "Something went wrong!";
$.pnotify({
title: 'Error',
text: text,
type: 'error'
});
}
回答by Mike Edwards
Javascript does not allow you to pass default arguments like that. You need to assign the default internally to the function.
Javascript 不允许您传递这样的默认参数。您需要在内部为函数分配默认值。
function errorNotification(text) {
text || (text = "Something went wrong!");
$.pnotify({
title: 'Error',
text: text,
type: 'error'
});
}
回答by Shelvacu
Note: The other answers won't work if you have a boolean value that you want to default to true. That's because anything||truewill always return true. Instead you should do something like:
注意：如果您有一个想要默认为 的布尔值，其他答案将不起作用true。那是因为anything||true会一直返回true。相反，您应该执行以下操作：
function foo(bar){
if(bar === undefined)
bar = true;
//rest of your function
}
回答by 123qwe
function [a-zA-Z0-9_]*?\s{0,}\([^=$)]*?(=)[^)$]*?\)it can be helpful to find js functions with default parameter and then correct them.
function [a-zA-Z0-9_]*?\s{0,}\([^=$)]*?(=)[^)$]*?\)找到带有默认参数的 js 函数然后更正它们会很有帮助。
