Summarize some js custom functions_javascript skills

1. dayin()
Function: Create a new page and print the content with the id of dayin, which can solve the problem of printing part of the content on a page.
Usage: Include the content to be printed by , and then define the
event


function dayin()
{
var code=""
code =document.all.dayin.innerHTML;
code=code.toUpperCase();
code=code.replace(/]*>Delete code=code.toLowerCase();
var newwin=window.open('','','');
newwin.opener = null;
newwin.document.write(code);
newwin.document.close();
}


where code=code.replace(/] *>Delete/gi, "");
is to filter out all deleted connections in the content

2. isNumber(st)
Function: Determine whether the variable st is It consists of numbers (including negative numbers and decimals). If it is, it returns true, otherwise it returns false.
function isNumber(st)
{
var Letters = "1234567890-.";
var i;
var c;
if(st.charAt( 0 )==' .')
return false;
if(st.charAt( 0 )=='-'&&st.charAt( 1 )=='.')
return false;
if( st. charAt( st.length - 1 ) == '-' )
return false;
for( i = 0; i < st.length; i )
{
c = st.charAt ( i );
if (Letters.indexOf( c ) < 0)
return false;
}
return true;
}


3. createCookie(name,value,days)
Function: Create a cookie with name name, value value, and validity period of days. Can be modified at the same time.
function createCookie(name,value,days){
var expires = "";
if (days) {
var date = new Date();
date.setTime(date. getTime() (days*24*60*60*1000));
expires = "; expires=" date.toGMTString();
};
document.cookie = name "=" value expires "; path="/";
};

4. readCookie(name)
Function: Read the value of the cookie based on the name. If none, returns null.
function readCookie(name){
var nameEQ = name "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i ) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
};
return null;
};

5. request(st)
Function: Get the value of a certain parameter in the browser address bar (not a perfect solution, for example, if there are spaces, you will get it, but it supports
Chinese)
function request(st) {
var ustr=document.location.search;
var intPos = ustr.indexOf("?");
var strRight = ustr.substr(intPos 1);
var arrTmp = strRight.split( "&");
for(var i = 0; i < arrTmp.length; i )
{
var arrTemp = arrTmp[i].split("=");
if (arrTemp[0].toUpperCase() == st.toUpperCase()) return arrTemp[1];
}
return "";
}

6. hideObject(obj)
Function: Hide obj
function hideObject(obj) {
obj.style.display = "none";
}

7. showObject(obj)
Function: Show obj
function showObject(obj) {
obj.style.display = "block";
}

8. trim(str)
Function: remove spaces on both sides of str

function trim(str)
{
return str.replace(/^s*|s*$/g,"");
}

9. function bj_date(d1,d2)
Function: Compare the size of d1,d2 dates
function bj_date(d1,d2)
{
/*
author:wxg
Function: Compare dates Size
Parameters: d1 d2
Character year-month-day type, such as 2005-01-22
Return value: 0/1/2
Numeric type
d1>d2 returns 0
d1=d2 returns 1
d1*/
if(d1==""&&d2==""){
return 3
}
if(d1==""||d2==""){
return 4
}
d1=d1.split("-")
d2=d2.split("-" )
var a = new Date(Number(d1[0]),Number(d1[1]),Number(d1[2]))
var b=new Date(Number(d2[0]) ,Number(d2[1]),Number(d2[2]))
a = a.valueOf()
b=b.valueOf()
if(a-b>0)
return 0
if(a-b==0)
return 1
if(a-b<0)
return 2
}


10. Format Convert numbers into currency format
function setCurrency(s){
if(/[^0-9.-]/.test(s)) return "invalid value";
s=s.replace( /^(d*)$/,"$1.");
s=(s "00").replace(/(d*.dd)d*/,"$1");
s= s.replace(".",",");
var re=/(d)(d{3},)/;
while(re.test(s))
s=s .replace(re,"$1,$2");
s=s.replace(/,(dd)$/,".$1");
return s.replace(/^./,"0 .")
}