要从JavaScript中的数组中删除项目，请先获取该项目，然后使用splice()方法将其删除。您可以尝试运行以下代码-
<html>
<body>
<script>
var array = [10, 30, 40, 80, 90];
var index = array.indexOf(90);
document.write("Original array: "+array);
if (index > -1) {
array.splice(index, 1);
}
document.write("<br>New array after deletion: "+array);
</script>
</body>
</html>输出结果
Original array: 10,30,40,80,90 New array after deletion: 10,30,40,80