1。无对话框关闭窗口

   window.opener=null 
    window.open("","_self") 
    window.close();  

2。每次都刷新页面，防止showModalDialog只取缓存数据,

//网页不保存在缓存中，每次访问都刷新页面。
<meta http-equiv="cache-control" content="no-cache, must-revalidate">

3.? 日期操作

?

var now = new Date();                    //当前日期   
var nowDayOfWeek = now.getDay();         //今天本周的第几天   
var nowDay = now.getDate();              //当前日   
var nowMonth = now.getMonth();           //当前月   
var nowYear = now.getYear();             //当前年   
nowYear += (nowYear < 2000) ? 1900 : 0;  //   
  
//格式化日期：yyyy-MM-dd   
function formatDate(date) {    
    var myyear = date.getFullYear();   
    var mymonth = date.getMonth()+1;   
    var myweekday = date.getDate();    
       
    if(mymonth < 10){   
        mymonth = "0" + mymonth;   
    }    
    if(myweekday < 10){   
        myweekday = "0" + myweekday;   
    }   
    return (myyear+"-"+mymonth + "-" + myweekday);    
}    
  
//获得某月的天数   
function getMonthDays(myMonth){   
    var monthStartDate = new Date(nowYear, myMonth, 1);    
    var monthEndDate = new Date(nowYear, myMonth + 1, 1);    
    var   days   =   (monthEndDate   -   monthStartDate)/(1000   *   60   *   60   *   24);    
    return   days;    
}   
  
//获得本季度的开始月份   
function getQuarterStartMonth(){   
    var quarterStartMonth = 0;   
    if(nowMonth<3){   
       quarterStartMonth = 0;   
    }   
    if(2<nowMonth && nowMonth<6){   
       quarterStartMonth = 3;   
    }   
    if(5<nowMonth && nowMonth<9){   
       quarterStartMonth = 6;   
    }   
    if(nowMonth>8){   
       quarterStartMonth = 9;   
    }   
    return quarterStartMonth;   
}   
  
//获得本周的开始日期   
function getWeekStartDate() {    
    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);    
    return formatDate(weekStartDate);   
}    
  
//获得本周的结束日期   
function getWeekEndDate() {    
    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));    
    return formatDate(weekEndDate);   
}    
  
//获得本月的开始日期   
function getMonthStartDate(){   
    var monthStartDate = new Date(nowYear, nowMonth, 1);    
    return formatDate(monthStartDate);   
}   
  
//获得本月的结束日期   
function getMonthEndDate(){   
    var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));    
    return formatDate(monthEndDate);   
}   
  
//获得本季度的开始日期   
function getQuarterStartDate(){   
       
    var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);    
    return formatDate(quarterStartDate);   
}   
  
//或的本季度的结束日期   
function getQuarterEndDate(){   
    var quarterEndMonth = getQuarterStartMonth() + 2;   
    var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));    
    return formatDate(quarterStartDate);   
}   
  
 

?? 4. 去掉字符串空格

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function String.prototype.trim(){
      return this.replace(/(^(\s|\u3000)*)|((\s|\u3000)*$)/g, '');
}

??? 5.禁止反复提交

???

//首先在form中加入
onsubmit="return checkSubmit();"
//例如：
<html:form enctype="multipart/form-data" action="<%=url %>" 
method="post" onsubmit="return checkSubmit();">　　

//再如以下代码：
var checkSubmitFlg = false; 
function checkSubmit() { 
　　if (checkSubmitFlg == true) { 
　　    return false; 
　　} 
　　checkSubmitFlg = true; 
　　return true; 
} 
document.ondblclick = function docondblclick() { 
　　window.event.returnValue = false; 
} 
document.onclick = function doconclick() { 
if (checkSubmitFlg) { 
　　   	  window.event.returnValue = false; 
　　   } 
}

?6.失去焦点调用方法

?

var fstationname = document.getElementById("fsApprovebookDto.fstationname");
fstationname.onblur=getStationnameCount;
//getStationnameCount function名称

?7.ifr