Summary some javascript UDF _ javascript skills

Summary of some js custom functions 1. dayin ()
Purpose: Create a page and print the content with the id "dayin" to solve the problem of printing part of the content on a page.
Usage: the content to be printed is included and then defined in a button
Event


Function dayin ()
{
Var code =""
Code + = document. all. dayin. innerHTML;
Code = code. toUpperCase ();
Code = code. replace (/] *> Delete <\/A>/gi ,"");
Code = code. toLowerCase ();
Var newwin = window. open ('','','');
Newwin. opener = null;
Newwin.doc ument. write (code );
Newwin.doc ument. close ();
}


Code = code. replace (/] *> Delete <\/A>/gi ,"");
Is to filter out all the deleted connections in the content

2. isNumber (st)
Purpose: judge whether the st variable is composed of numbers (including negative numbers and decimals). If true is returned, false is returned.
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)
Purpose: Create a cookie with the name, value as values, and validity period as days. It can also be modified.
Function createCookie (name, value, days ){
Var expires = "";
If (days ){
Var date = new Date ();
Date. setTime (date. getTime () + (days * 24x60*60*1000 ));
Expires = "; expires =" + date. toGMTString ();
};
Document. cookie = name + "=" + value + expires + "; path = /";
};

4. readCookie (name)
Purpose: Read the cookie value based on the name. If no value exists, null is returned.
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)
Purpose: Get the value of a parameter in the address bar of the browser (not perfect. For example, % 20 will be obtained if there is space, but it is supported
(Chinese)
Function request (st ){
Var ustr = document. location. search;
Var intPos = ustr. indexOf ("? ");
Var strRight = ustr. substr (intPos + 1 );
Var arrTmp = strRight. split ("% 26 ");
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)
Purpose: Hide obj
Function hideObject (obj ){
Obj. style. display = "none ";
}

7. showObject (obj)
Purpose: Display obj
Function showObject (obj ){
Obj. style. display = "block ";
}

8. trim (str)
Purpose: Remove spaces on both sides of str

Function trim (str)
{
Return str. replace (/^ \ s * | \ s * $/g ,"");
}

9. function bj_date (d1, d2)
Purpose: Compare the date sizes of d1 and d2
Function bj_date (d1, d2)
{
/*
Author: wxg
Purpose: Compare the date size.
Parameter: d1 d2
Renewed year-month-day type, for example
Return Value: 0/1/2
Number 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 the number into a currency format
Function setCurrency (s ){
If (/[^ 0-9 \. \-]/. test (s) return "invalid value ";
S = s. replace (/^ (\ d *) $/, "$1 .");
S = (s + "00"). replace (/(\ d * \. \ d) \ d */, "$1 ");
S = s. replace (".",",");
Var re =/(\ d) (\ d {3 },)/;
While (re. test (s ))
S = s. replace (re, "$1, $2 ");
S = s. replace (/, (\ d) $/, ". $1 ");
Return s. replace (/^ \./, "0 .")
}