void 0 or undefined
- in old browsers undefined's value can be rewrite，so we use void 0
- in new browsers undefined can't change it's value, so just the same.
void operator
the void operator evaluates the given expression and returns undefined
uses:
-
iife
void function () { console.log("Executed!"); }(); -
JavaScript URIs
<a href="javascript:void(0);"> Click here to do nothing </a> <a href="javascript:void(document.body.style.backgroundColor='green');"> Click here for green background </a> -
Non-leaking Array Functions
button.onclick = () => void doSomething();
