2008年12月11日 · I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype.value.

Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact === or !== operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide.

The nullish coalescing operator (??) in JavaScript only considers null or undefined as "nullish" values. If the left-hand side is any other value, even falsy values like "" (empty string), 0, or false, it will not use the right-hand side:

2011年6月7日 · The conditional (ternary) operator is the only JavaScript operator that takes three operands. This operator is frequently used as a shortcut for the if statement.

In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol. Everything else is an object. The primitive types boolean, string and number can be wrapped by their object counterparts. These objects are instances of the Boolean, String and Number constructors respectively.

2013年3月13日 · I'm just started to learn HTML. Doing an alert() on one of my variables gives me this result [object HTMLInputElement]. How to get the data, that were added in text field, where my input type is ...

What's the difference between & and && in JavaScript? Asked 13 years, 11 months ago Modified 1 year, 4 months ago Viewed 143k times

That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value associated with either the first non-false variable value or whatever the last variable contains.

2010年3月2日 · How to use OR condition in a JavaScript IF statement? Asked 15 years, 5 months ago Modified 2 years, 6 months ago Viewed 875k times

How to remove all event listeners of a DOM object in JavaScript? Asked 14 years, 8 months ago Modified 2 months ago Viewed 238k times