要在JavaScript中清空数组，请将变量设置为empty：
arr = []
您可以尝试运行以下代码以清空JavaScript中的数组：
<html>
<head>
<title>JavaScript Arrays</title>
</head>
<body>
<script>
var arr = ["orange", "mango", "banana", "sugar", "tea"];
document.write("<br />Original array: " + arr );
arr = [];
document.write("<br />Current array: " + arr );
</script>
</body>
</html>