始终牢记有关delete的以下几点：delete是JavaScript中的关键字，因此不应更改，并且您不能在单个变量中使用delete对象，因为它仅用于删除对象的属性。
delete关键字用于从JavaScript对象中删除属性，如以下代码所示-
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var cricketer = {
name:"John",
rank:3,
points: 800
};
delete cricketer.rank;
document.getElementById("demo").innerHTML =
cricketer.name + " has " + cricketer.rank + " rank.";
</script>
</body>
</html>