如何检查 JavaScript 中的空字符串？

Question

I saw this thread, but I didn't see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking for ""?

转载于:https://stackoverflow.com/questions/154059/how-do-you-check-for-an-empty-string-in-javascript

Answer 1

If you just want to check whether there's any value, you can do

if (strValue) {
    //do something
}

If you need to check specifically for an empty string over null, I would think checking against "" is your best bet, using the === operator (so that you know that it is, in fact, a string you're comparing against).

if (strValue === "") {
    //...
}