//作用：日期时间格式化
//参数1：时间对象
//参数2：连接符
//参数3：是否返回时分秒 (true返回,false不返回时分秒)
//返回值：格式化后的时间字符串
function toFormat(date,splitStr,filed){
   var year = date.getFullYear();
   var month = date.getMonth() + 1;
   if(month < 10){
      month = "0" + month;
   }
   var day = date.getDate();
   if(day < 10){
      day = "0" + day;
   }
   var hour = date.getHours();
   if(hour < 10){
      hour = "0" + hour;
   }
   var minute = date.getMinutes();
   if(minute < 10){
      minute = "0" + minute;
   }
   var second = date.getSeconds();
   if(second < 10){
      second = "0" + second;
   }
   var time = year + splitStr + month + splitStr + day + " " + hour + ":" + minute + ":" + second;
   if(filed){
      time = year + splitStr + month + splitStr + day;
   }
   return time;
}
/*
   调用示例：
   var date = new Date();
   var result = toFormat(date,"-")
*/

//获取滚动条高度
return document.documentElement.scrollTop + document.body.scrollTop;
//设置滚动条高度
document.documentElement.scrollTop = document.body.scrollTop = top;

//获取可视区高度及宽度
//不需要参数
function getWidth(){
   if(window.innerWidth){
      return window.innerWidth;
   }
   else{

      if(document.compatMode == "CSS1Compat"){
         return document.documentElement.clientWidth;
      }
      else{
         return document.body.clientWidth;
      }
   }
}

function getHeight(){
   if(window.innerHeight){
      return window.innerHeight;
   }
   else{
      if(document.compatMode == "CSS1Compat"){
         return document.documentElement.clientHeight;
      }
      else{
         return document.body.clientHeight;
      }
   }
}

三目运算法获得可视区高度
function getHeight(){
     return window.innerHeight || document.compatMode == "CSS1Compat" ? 
     document.documentElement.clientHeight : document.body.clientHeight;
}

//获取所传参数
function GetRequest() {
    var url = location.search;
    var theRequest = new Object();
    if (url.indexOf("?") != -1) {
        var str = url.substr(1);
        strs = str.split("&");
        for(var i = 0; i < strs.length; i ++) {
            theRequest[strs[i].split("=")[0]]=(strs[i].split("=")[1]);
        }
    }
    return theRequest;
}

//按需加载js文件
function loadScript(scriptUrl, callback) {
    var elem, bl,
        isExecuted = false; // 防止在ie9中，callback执行两次

    if (scriptUrl == null) {
        return;
    }
    elem = document.createElement(‘script‘);
    if ( typeof(callback) === ‘function‘ )  {
        bl = true;
    }

    elem.src = http://www.mamicode.com/scriptUrl;
    document.getElementsByTagName(‘head‘)[0].appendChild(elem);
    // for ie
    function handle(){
        var status = elem.readyState;
        if (status === ‘loaded‘ || status === ‘complete‘) {
            if (bl && !isExecuted) {
                callback();
                isExecuted = true;
            }
            elem.onreadystatechange = null;
        }
    }
    elem.onreadystatechange = handle;

    // for 非ie
    if (bl && !isExecuted) {
        elem.onload = callback;
        isExecuted = true;
    }
}


//判断用户的浏览设备是移动设备还是PC
//返回值为true的时候为移动端
//返回值为false时为PC端
function browserRedirect() {
   var sUserAgent = navigator.userAgent.toLowerCase();
   var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
   var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
   var bIsMidp = sUserAgent.match(/midp/i) == "midp";
   var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
   var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
   var bIsAndroid = sUserAgent.match(/android/i) == "android";
   var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
   var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
   document.writeln("您的浏览设备为：");
   if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
       return true;
   } else {
       return false;
   }
}

常用函数封装（实时更新）