Ajax 小記with 用法

先看例子:

<script type="text/javascript">
         //可斷定這個瀏覽器是IE 或非IE, 注意if 的判斷條件, 如果這個瀏覽器對象的innerWidth返回值爲true, 證明
         //這個瀏覽器不是IE.
         if(window.innerWidth) {
                 document.write("no IE inner: "+window.innerWidth+"  x  "+window.innerHeight);
         } else {
             document.write("IE:"+document.body.clientWidth+" x "+document.body.clientHeight);
         }
 </script>

 

 如果用with 程序可簡化爲:

<script type="text/javascript">
    if(window.innerWidth) {
        with(window) {
            document.write("no IE inner: "+innerWidth+"  x  "+innerHeight);
        }
    } else {
        with(document.body) {
            document.write("IE:"+clientWidth+" x "+clientHeight);
        }
    }
</script>