检查是否存在任何 Key localStorage Javascript
Check if exist any Key localStorage Javascript
我需要检查 localStorage 中是否有任何密钥
此代码无效
if (localStorage.user === undefined) {
alert('There is no key!');
}
您需要使用getItem
if (localStorage.getItem("user") === null) {
alert('Não há chave!');
}
编辑
您可以通过
检查localstorage是否为空
if (localStorage.length == 0)
if (Object.keys(localStorage).length === 0) {
alert('There is no key!');
}
我需要检查 localStorage 中是否有任何密钥 此代码无效
if (localStorage.user === undefined) {
alert('There is no key!');
}
您需要使用getItem
if (localStorage.getItem("user") === null) {
alert('Não há chave!');
}
编辑 您可以通过
检查localstorage是否为空if (localStorage.length == 0)
if (Object.keys(localStorage).length === 0) {
alert('There is no key!');
}