js 获取页面高度和宽度(兼容 ie firefox chrome),获取鼠标点击位置

<script>
//得到页面高度
 var yScroll = (document.documentElement.scrollHeight >document.documentElement.clientHeight) ? document.documentElement.scrollHeight : document.documentElement.clientHeight;
  alert(yScroll)
//得到页面宽度
 var xScroll=(document.documentElement.scrollWidth>document.documentElement.clientWidth) ? document.documentElement.scrollWidth : document.documentElement.scrollWidth;

  alert(xScroll)

  </script>



   //获取鼠标点击位置,兼容ie、firefox

<body onclick="clicksEvent(event)">

    function pointerX(event) {
        event = window.event || event;
        return event.pageX || (event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));
    }
    function pointerY(event) {
        event = window.event || event;
        return event.pageY || (event.clientY + (document.documentElement.scrollTop || document.body.scrollTop));
    }

 

    //平台、设备和操作系统
    var system = {
        win: false,
        mac: false,
        xll: false
    };
    //检测平台
    var p = navigator.platform;
    system.win = p.indexOf("Win") == 0;
    system.mac = p.indexOf("Mac") == 0;
    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
    if (system.win || system.mac || system.xll) {
        //平台、设备和操作系统
    } else {
        //手机
    }
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