js 常用函数
js 常用函数
///日期格式化
function formatDate(sDate) {
var sScrap = "";
if ((sDate.indexOf("-") != -1) && (sDate.indexOf("/") == -1))
{
var re=/-/i;
sDate=sDate.replace(re,"/");
}
var dScrap = new Date(sDate);
if (dScrap == "NaN") return sScrap;
iDay = dScrap.getDate();
iMon = dScrap.getMonth();
iYea = dScrap.getFullYear();
sScrap = iYea + "/" + (iMon + 1) + "/" + iDay ;
return sScrap;
}
//此函数用于计算date2 -date1所得的天数。
function dateDiff(date1,date2)
{
var diff;
var timeDiff;
var dateTmp;
dateTmp=new Date(date2);
diff=dateTmp.getTime();
dateTmp=new Date(date1);
timeDiff=diff - dateTmp.getTime();
diff = parseInt(Math.floor(timeDiff / (1000 * 60 * 60 * 24)));
diff++;
return diff;
}
/*去除字符串空格的函数*/
function Trim(s)
{
var m = s.match(/^\s*(\S+(\s+\S+)*)\s*$/);
return (m == null) ? "" : m[1];
}
/* 实现了中英文混合字符串取长度*/
/* 取得字符串的字节长度 */
function strLen(str)
{
if(str==null) return 0;
var i;
var len;
var strTmp;
strTmp=str;
len = 0;
for (i=0;i255) len+=2;
else len++;
}
return len;
}
/* 检测字符串是否为空 */
function isNull(str)
{
var i;
var strTmp;
strTmp=str;
for (i=0;i0)
{
var value1 = value + "";
var dotIndex = value.indexOf(".");
if(dotIndex==-1)
return value;
else
{
if(dotIndex + num + 1 == value.length)
return value;
else
{
var float = takeOut(value);
float = Math.round(float*Math.pow(10,num))/Math.pow(10,num);
return float;
}
}
}
else
return Math.round(takeOut(value));
}
function formatnumber(value,num) //直接去尾
{
var a,b,c,i
a = value.toString();
b = a.indexOf('.');
c = a.length;
if (num==0)
{
if (b!=-1)
a = a.substring(0,b);
}
else
{
if (b==-1)
{
a = a + ".";
for (i=1;i<=num;i++)
a = a + "0";
}
else
{
a = a.substring(0,b+num+1);
for (i=c;i<=b+num;i++)
a = a + "0";
}
}
return a
}
//为数值增加分节符函数
function commafy(num)
{
num = num+"";
var re=/(-?\d+)(\d{3})/
var indexPoint = num.indexOf(".");
if(indexPoint >= 0)
{
var numB = num.split(".")[0];
var numE = num.split(".")[1];
while(re.test(numB)){
numB=numB.replace(re,"$1,$2")
}
num = numB + "." + numE;
}
else
{
while(re.test(num)){
num=num.replace(re,"$1,$2")
}
}
return num;
}
//删除数值型字符串中的逗号分隔符
function takeOut(val)
{
var i;
var j;
j=parseInt(val.length/3) +1;
val = val.replace("￥","");
for (i=0;i<=j;i++)
{
val=val.replace(',',"");
}
return val
}
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