2021年8月30日 · Usage of javascript:void(0) means that the author of the HTML is misusing the anchor element in place of the button element. Anchor tags are often abused with the onclick event to create pseudo-buttons by setting href to "#" or "javascript:void(0)" to …

2012年12月5日 · The other question could be construed as asking about either the javascript: URI scheme or the void(0) construct. This one is unambiguously about the latter, so the other should have been closed as a duplicate of this one, not the other way around.

2019年7月10日 · The so-called safe bool idiom is a misnomer, though -- dirty hack would be better suited. It is by no means safe, or expresses intent well. A bool communicates: "this is a yes or no value" whereas a void* communicates "I am a pointer, please dereference me". Which, for (void*)0 or (void*)1usually isn't such a brilliant idea. The fact that it ...

2014年10月21日 · Which implies, strictly speaking, that (void*)0 is a null pointer constant, but ((void*)0) is not. Then: I'm sure that most C implementations do treat a parenthesized null pointer constant as a null pointer constant, and define NULL either as 0, ((void*)0), or in some other manner. The two referenced sections say: § 6.3.2.3

2012年7月24日 · A void * can be converted to any other pointer type without an explicit cast. You cannot dereference a void * or do pointer arithmetic with it; you must convert it to a pointer to a complete data type first. void * is often used in places where you

2011年4月19日 · Where as void 0 is void 0 anywhere. Anyways, this technique will surely confuse the JITs which already optimize undefined (FF, Chrome but not IE10) because it's a global constant and even static analysis can see if it's shadowed. With this, you turn it into a normal variable look-up and it's not a compile-time constant for sure.

gcc has an extension that treats sizeof (void) as 1. gcc is not a conforming C compiler by default, so in its default mode it doesn't warn about sizeof (void). Extensions like this are permitted even for fully conforming C compilers, but the diagnostic is still required.

2016年7月29日 · The void operator evaluates the given expression and then returns undefined. The void operator is often used merely to obtain the undefined primitive value, usually using “void(0)” (which is equivalent to “void 0”). In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value).

Question: javascript:void(0); 1 Start Access. Open the downloaded Access file named MIS 301_Access_Test.accdb. 0 2 FlyerU wants to keep data about course sections to be offered in the upcoming term. Classrooms cannot seat more than 35 students. Create a table named SECTION to store the fields with the properties as specified

javascript:undefined; javascript:void 0; javascript: With the exception that undefined can be overridden by declaring a variable with the same name. Use of void 0 is generally pointless, and it's basically been whittled down from void functionThatReturnsSomething().