javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}check if localstorage key exists
if (localStorage.getItem("username") === null) {
//...
}check if item exists in localstorage javascript
//If the given key does not exist in the list associated with the object then this method must return null.
if (localStorage.getItem("infiniteScrollEnabled") === null) {
//...
}check if localstorage key exists js
if("user" in localStorage){
alert('yes');
} else {
alert('no');
}Copyright © 2021 Codeinu
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