要从JavaScript数组中删除元素，请首先使用indexOf()方法获取要删除的元素的索引。之后使用splice()方法-
<html>
<body>
<script>
var array = [40, 20, 70, 50];
var index = array.indexOf(70);
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: 40,20,70,50 New array after deletion: 40,20,50