最近經常遇到js兩個數組比較元素差別，特此記錄方便以後查找。
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<title>測試</title>
<script type="text/javascript">
var a1 = [1,3,4,5,6];
var a2 = [2,3,7];
var shao = [];
var duo = [];
var hebing = a1.concat(a2);
hebing.sort();
hebing.reverse();
var quchong = $.unique(hebing);
console.info(a1);
console.info(a2);
console.info(quchong);
quchong.forEach(function(qitem,index,array){
if(a1.every(function(item,qindex,array){return qitem != item;}))
{
duo.push(qitem);
}
if(a2.every(function(item,qindex,array){return qitem != item;}))
{
shao.push(qitem);
}
});
console.info("a2比a1多的元素"+duo);
console.info("少的元素"+shao);
</script>
</head>
<body>
</body>
</html>