javascript on double click
document.getElementById("myBtn").addEventListener("dblclick", function() {
alert("Hello World!");
});javascript on double click
document.getElementById("myBtn").addEventListener("dblclick", function() {
alert("Hello World!");
});javascript double question mark
let a = null;
const b = a ?? -1; // Same as b = ( a != null ? a : -1 );
console.log(b); // output: -1
//OR IF
let a = 9;
const b = a ?? -1;
console.log(b); // output: 9
//PS.,VERY CLOSE TO '||' OPERATION IN FUNCTION, BY NOT THE SAMEjavascript double exclamation mark
const isIE8 = !! navigator.userAgent.match(/MSIE 8.0/);
console.log(isIE8); // returns true or falsejavascript double exclamation mark
console.log(navigator.userAgent.match(/MSIE 8.0/));
// returns either an Array or nulljavascript double exclamation mark
console.log(!!navigator.userAgent.match(/MSIE 8.0/));
// returns either true or falseCopyright © 2021 Codeinu
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