run function on hash change js code example

Example 1: js detect hash change

// Event listener
window.addEventListener("hashchange", e=>console.log('changed'), {});
// Event handler
window.onhashchange = e => console.log('changed');
// HTML event handler
<body onhashchange="funcRef();">

Example 2: javascript detect URL hash change

window.addEventListener("onhashchange", function(){
    //url hash # has changed
});

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Javascript Example

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