js脚本保留两位小数的方法

<script type="text/javascript">google_ad_client = "pub-2048279401139630";google_ad_slot = "8856771542";google_ad_width = 728;google_ad_height = 90;document.write("<s"+"cript type='text/javascript' s"+"rc='http://pagead2.googlesyndication.com/pagead/show_ads"+"."+"js'></scr"+"ipt>");</script>

方法一：

<script language="javascript">
    var val = 2.0489122;
    alert(Math.ceil(val*100)/100);
</script>

方法二：

<script language="javascript">
    var val = 2.0489122;
    alert(val.toFixed(2));
</script>