判断localStorage.getItem属性是否存在
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
if (localStorage.getItem("key") != null) {
//自定义代码
alert('key 存在')
}else{
alert('key 不存在')
}
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
if (localStorage.getItem("key") != null) {
//自定义代码
alert('key 存在')
}else{
alert('key 不存在')
}
</script>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
if (localStorage.getItem("key") != null) {
//自定义代码
alert('key 存在')
}else{
alert('key 不存在')
}
</script>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
if (localStorage.getItem("key") != null) {
//自定义代码
alert('key 存在')
}else{
alert('key 不存在')
}
</script>
</body>
</html>判断localStorage.getItem属性是否存在
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
if (localStorage.getItem("key") != null) {
//自定义代码
alert('key 存在')
}else{
alert('key 不存在')
}
</script>
</body>
</html>
