工作中用到，記錄一下，

<script>
var online= new Array(); //全域性變數，
</script>
<script src=" http://webpresence.qq.com/getonline?Type=1&qq號:"></script> //網路返回一個online陣列正好覆蓋上面定義的online 如：online[0]=1;
<script>
if (online[0]==0)
document.write("不線上");
else
document.write("線上");
</script>

注意qq號後面要加“:”

<script src=" http://webpresence.qq.com/getonline?Type=1&qq號:"></script>

這種方式有效的解決了該問題