js常用自定义公共函数汇总_基础知识

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

//检查是否是日期格式
function isDate(datestr){
var result = datestr.match(/((^((1[8-9]\d{2})|([2-9]\d{3}))(-)(10|12|0?[13578])(-)(3[01]|[12][0-9]|0?[1-9])$)|(^((1[8-9]\d{2})|([2-9]\d{3}))(-)(11|0?[469])(-)(30|[12][0-9]|0?[1-9])$)|(^((1[8-9]\d{2})|([2-9]\d{3}))(-)(0?2)(-)(2[0-8]|1[0-9]|0?[1-9])$)|(^([2468][048]00)(-)(0?2)(-)(29)$)|(^([3579][26]00)(-)(0?2)(-)(29)$)|(^([1][89][0][48])(-)(0?2)(-)(29)$)|(^([2-9][0-9][0][48])(-)(0?2)(-)(29)$)|(^([1][89][2468][048])(-)(0?2)(-)(29)$)|(^([2-9][0-9][2468][048])(-)(0?2)(-)(29)$)|(^([1][89][13579][26])(-)(0?2)(-)(29)$)|(^([2-9][0-9][13579][26])(-)(0?2)(-)(29)$))/);
if(result==null){
return "no";
}
return "yes";
}

//此方法以上面效果一致
function isDate2(datestr) {
var result = datestr.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
if (result == null)
return "no";
var d = new Date(result[1], result[3] - 1, result[4]);
if((d.getFullYear() == result[1] && (d.getMonth() + 1) == result[3] && d.getDate() == result[4])){
return "yes";
}
return "no";
}

//判断输入的字符是否为中文
function IsChinese(str){
if(str.length!=0){
reg=/^[\u0391-\uFFE5]+$/;
if(!reg.test(str)){
// alert("对不起，您输入的字符串类型格式不正确!");
return "no";
}
}
return "yes";
}


//判断是否为空
function isEmpty(str){
if(str==null||typeof str=="undefined"||str.trim()==""){
return true;
}else{
return false;
}
}

//固定电话
function testTelephone(phone){
var phone_reg = new RegExp(/^([+]{0,1}\d{3,4}|\d{3,4}-)?\d{7,8}$/);
if(!phone_reg.test(phone)){
return "no";
}
return "yes";
}
//折扣
function isDiscount(discount){
var phone_reg = new RegExp(/^(0([\.]\d{1,2})|1|1.00|1.0)$/);
if(!phone_reg.test(discount)){
return "no";
}
return "yes";
}
//手机号码
function testMobile(mobile){
var mobile_reg = new RegExp(/^0{0,1}1[0-9]{10}$/);
if(!mobile_reg.test(mobile)){
return "no";
}
return "yes";
}
//QQ号码从10000开始
function testQQ(qq){
var qq_reg = new RegExp(/^[1-9][0-9]{4,}$/);
if(!qq_reg.test(qq)){
return "no";
}
return "yes";
}
//电子邮件
function testEmail(email){
var email_reg = new RegExp(/^\w+([-+.]\w+)*@\w+([-.]\w+)*.\w+([-.]\w+)*$/);
if(!email_reg.test(email)){
return "no";
}
return "yes";
}

//不带符号的正整数
function testPlusDigit(digit){
var plusDigit_reg = new RegExp(/^\d+$/);
if(!plusDigit_reg.test(digit)){
return "no";
}
return "yes";
}

//DOUBLE价格
function testPriceFormat(str){
var priceFormatReg = new RegExp(/^\d+(.\d{1,2})?$/);
if(!priceFormatReg.test(str)){
return "no";
}
return "yes";
}

//身份证
function testIDCard(str){
var IDCardReg = new RegExp(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/);
if(!IDCardReg.test(str)){
return "no";
}
return "yes";
}

//2012-06-19日期格式
function testDate(str){
var dateReg = new RegExp(/(^\d{4}-[0,1][0-9]-[0-3][0-9]$)/);
if(!dateReg.test(str)){
return "no";
}
return "yes";
}



//浮点数精确运算(加法)
function accAdd(arg1,arg2){
var r1,r2,m,n;
try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
m=Math.pow(10,Math.max(r1,r2));
n=(r1>=r2)?r1:r2;
return ((arg1*m+arg2*m)/m).toFixed(n);
}
Number.prototype.add = function (arg){
return accAdd(arg,this);
}

//浮点数精确运算(减法)
function accSub(arg1,arg2){
return accAdd(arg1,-arg2);
}
Number.prototype.subtract = function (arg){
return accSub(this,arg);
}

//浮点数精确运算(乘法)
function accMul(arg1,arg2)
{
var m=0,s1=arg1.toString(),s2=arg2.toString();
try{m+=s1.split(".")[1].length}catch(e){}
try{m+=s2.split(".")[1].length}catch(e){}
return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m)
}
Number.prototype.mul = function (arg){
return accMul(arg, this);
}

//浮点数精确运算(除法)
function accDiv(arg1,arg2){
var t1=0,t2=0,r1,r2;
try{t1=arg1.toString().split(".")[1].length}catch(e){}
try{t2=arg2.toString().split(".")[1].length}catch(e){}
with(Math){
r1=Number(arg1.toString().replace(".",""))
r2=Number(arg2.toString().replace(".",""))
return (r1/r2)*pow(10,t2-t1);
}
}
Number.prototype.div = function (arg){
return accDiv(this, arg);
}

//限制输入数字
function isNumber(e) {
if ($.browser.msie) {
if ( ((event.keyCode > 47) && (event.keyCode (event.keyCode == 8) ) {
return true;
} else {
return false;
}
} else {
if ( ((e.which > 47) && (e.which (e.which == 8) ) {
return true;
} else {
return false;
}
}
}


//字符串长度截取
function cutstr(str, len) {
var temp;
var icount = 0;
var patrn = /[^\x00-\xff]/;
var strre = "";
for (var i = 0; i if (icount temp = str.substr(i, 1);
if (patrn.exec(temp) == null) {
icount = icount + 1;
} else {
icount = icount + 2;
}
strre += temp;
} else {
break
}
}
return strre + "...";
}

//获取域名主机
function getHost(url) {
var host = "null";
if (typeof url == "undefined" || null == url) {
url = window.location.href;
}
var regex = /^\w+\:\/\/([^\/]*).*/;
var match = url.match(regex);
if (typeof match != "undefined" && null != match) {
host = match[1];
}
return host;
}

//判断某个值是否在所在范围
//rang=1 表示正整数[0,2147483647] 2表示float[0,3.4028235E38]
//return= 'empty' 表示输入为空,
function isRang(str,rang){
if(typeof str == "number"){
var num = Number(str);
//判断是否在正整数范围
if( rang == 1){
if(testPlusDigit(num)=="yes"){
if(num>=0&&numreturn "is_int";
}else{
return "is_not_int_rang";
}
}else{
return "is_not_int";
}
}else if(rang == 2){
if(testPriceFormat(num)=="yes"){
if(num>=0&&numreturn "is_float";
}else{
return "is_not_float_rang";
}
}else{
return "is_not_float";
}
}else{
return "rang_is_not_right";
}
}else{
return "is_not_number";
}
}