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Page 1/2 of some nice JS User-Defined Functions

Source: Internet
Author: User
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1. dayin ()
Purpose:You can create a page and print the content with the id of dayin to solve the problem of printing part of the content on a page.
Usage:The content to be printed is included by <span id = "dayin"> </span>, and then an event is defined in a button.
<Input type = "button" onclick = "dayin ()" value = "print">
Copy codeThe Code is as follows:
Function dayin ()
{
Var code = "<body onload = window. print ()>"
Code + = document. all. dayin. innerHTML;
Code = code. toUpperCase ();
Code = code. replace (/<A [^>] *> 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 (/<A [^>] *> Delete <\/A>/gi ,"");
Is to filter out all the deleted connections in the content

2. isNumber (st)
Function: Determines whether the st variable is composed of numbers (including negative numbers and decimals). If true is returned, false is returned.
Copy codeThe Code is as follows:
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.
Copy codeThe Code is as follows:
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.
Copy codeThe Code is as follows:
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 Chinese is supported)
Copy codeThe Code is as follows:
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
Copy codeThe Code is as follows:
Function hideObject (obj ){
Obj. style. display = "none ";
}

7. showObject (obj)
Purpose: Display obj
Copy codeThe Code is as follows:
Function showObject (obj ){
Obj. style. display = "block ";
}

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Related Keywords:
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