本文实例讲述了js数组相减。分享给大家供大家参考，具体如下：
<!DOCTYPE html>
<html>
<head>
<title>js数组相减</title>
</head>
<body>
<script type="text/javascript">
function arrChange( a, b ){
for (var i = 0; i < b.length; i++) {
for (var j = 0; j < a.length; j++) {
if (a[ j ] == b[ i ]) {//如果是id相同的，那么a[ j ].id == b[ i ].id
a.splice(j, 1);
j = j - 1;
}
}
}
return a;
}
var a=[1,2,3,4,5,6,7,8]
var b=[4,5,6,7,8,9,10]
debugger
arrChange(a,b)
console.log(a)//[1, 2, 3]
</script>
</body>
</html>
运行结果：
