Various common JS functions _ basic knowledge

JS functions are often used in many ways, such as getting page address parameters, address redirection, and determining whether a number is required. I have sorted out some information in this article. If you are interested, refer to Js to get page address parameters.

The Code is as follows:

Function getUrlPara (paraName)
{
Var sUrl = location. href;
Var sReg = "(? ://? | &) {1} "+ paraName +" = ([^ &] *)"
Var re = new RegExp (sReg, "gi ");
Re.exe c (sUrl );
Return RegExp. $1;
}

Address jump

The Code is as follows:

Var pn = $ ("# gotopagenum"). val (); // # gotopagenum is the id attribute of the text box.
Location. href = "NewList. aspx? Pagenum = "+ pn; // location. href: Jump to the client page

Sub-location

The Code is as follows:

Function Convert (money)
{
Var s = money; // obtain decimal data
S + = "";
If (s. indexOf (".") =-1) s + = ". 00"; // if there is no decimal point, add the following decimal points and 00
If (/\. \ d $/. test (s) s + = "0"; // Regular Expression
While (/\ d {4} (\. |,)/. test (s) // replace
S = s. replace (/(\ d) (\ d {3 }(\. |,)/, "$1, $2"); // Add
Return s;
}

Determines whether a number is used.

The Code is as follows:

Function IsNumeric (txt ){
If (txt = ""){
Return false;
}

If (txt. indexOf (",")> 0 ){
Txt = txt. replace (",","");
}

If (isNaN (txt )){
Return false;
}
Else {
Return true;
}
}

Format the number with two decimal places

The Code is as follows:

Function changeTwoDecimal_f (x ){
Var f_x = parseFloat (x );
If (isNaN (f_x )){
Alert ('function: changeTwoDecimal-> parameter error ');
Return false;
}
F_x = Math. round (f_x * 100)/100;
Var s_x = f_x.toString ();
Var pos_decimal = s_x.indexOf ('.');
If (pos_decimal <0 ){
Pos_decimal = s_x.length;
S_x + = '.';
}
While (s_x.length <= pos_decimal + 2 ){
S_x + = '0 ';
}
Return s_x;
}

The number calculation function parseFloat parseInt in Js.

Preset query conditions for the current js date yyyy-mm-dd

The Code is as follows:

Var now = new Date ();
Var year = now. getYear ();

If (now. getYear () <1900 ){
Year = now. getYear () + 1900;
}

Var month = now. getMonth () + 1;
Var day = now. getDate ();

If (month <10) month = "0" + month;
If (day <10) day = "0" + day;

$ ("# TxtDate1"). val (year. toString () + "-" + month. toString () + "-01 ");
$ ("# TxtDate2"). val (year. toString () + "-" + month. toString () + "-" + day. toString ());

Js gets the timestamp, replacing the Guid in some scenarios

The Code is as follows:

Function NowTimeCode ()
{
Var Result = "";

Var now = new Date ();

Var year = now. getYear ();

If (now. getYear () <1900 ){
Year = now. getYear () + 1900;
}

Var month = now. getMonth () + 1;
Var day = now. getDate ();
Var hour = now. getHours ();
Var minutes = now. getMinutes ();
Var second = now. getSeconds ();
Var millisecond = now. getMilliseconds ();

If (month <10) month = "0" + month;
If (day <10) day = "0" + day;
If (hour <10) hour = "0" + hour;
If (minutes <10) minutes = "0" + minutes;
If (second <10) second = "0" + second;

If (millisecond <10)
Millisecond = "00" + millisecond;
Else
{
If (millisecond <100)
{
Millisecond = "0" + millisecond;
}
}

Result = year. toString () + month. toString () + day. toString () + hour. toString () + minutes. toString () + second. toString () + millisecond. toString ();

Return Result;

}