【www.gdgbn.com--php函数】

//判断是否是日期型数据
function isDate(dateVal)
{
    var a1=dateVal.replace(/-/g,"/");
    var dd=new Date(a1);
    var ss=dd.getYear();
    if(isNaN(ss))
        return false;
    else
        return true;
}
//保留小数点精度，发现有些版本比较低的IE用不了toFixed函数，才写了这个
//oldData：原数据
//precision：精度
function toFixedFunc(oldData,precision)
{
    if(oldData.indexOf(".")>=0)
    {
        var diff=oldData.length-(oldData.lastIndexOf(".")+1)
        if(diff<=precision)
        {
       for(var i=0;i           oldData=oldData+"0";
        }
        else
        {
       //四舍五入
       oldData=oldData.substring(0,oldData.indexOf(".")+1+precision+1);
       var lastNum=parseInt(oldData.substring(oldData.length-1,oldData.length));
       oldData=oldData.substring(0,oldData.length-1);
       if(lastNum>=5)
       {
           var newData=parseInt(oldData.substring(0,oldData.indexOf("."))+oldData.substring(oldData.indexOf(".")+1,oldData.length));

本文来源：http://www.gdgbn.com/jiaocheng/8456/