Compilation of various commonly used JS functions_Basic knowledge-JS Tutorial-php.cn

Compilation of various commonly used JS functions_Basic knowledge

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Release： 2016-05-16 17:18:47

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Js gets the page address parameter

Copy code The code is as follows:

 
function getUrlPara(paraName) 
{ 
var sUrl = location.href; 
var sReg = "(?://?|&){1}" paraName "=([^&]*)" 
var re = new RegExp(sReg, "gi"); 
re.exec(sUrl); 
return RegExp.$1; 
} 

Address jump

Copy code The code is as follows:

 
var pn = $("#gotopagenum").val();//#gotopagenum It is the id attribute of the text box 
location.href = "NewList.aspx?pagenum=" pn;//location.href realizes the jump of the client page 

Thousandth place

Copy code The code is as follows:

 
function Convert(money) 
{ 
var s = money; //Get decimal data 
s = ""; 
if (s.indexOf(".") == -1) s = ".00"; //If there is no decimal point, add it at the end decimal point and 00 
if (/.d$/.test(s)) s = "0"; //Regular judgment
while (/d{4}(.|,)/.test(s )) //Replace if conditions are met 
s = s.replace(/(d)(d{3}(.|,))/, "$1,$2"); //Add every 3rd digit 
return s; 
} 

Judge whether it is a number

Copy code 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 to two decimal places

Copy code 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; 
} 

Js function parseFloat parseInt for numerical operations

js current date yyyy-mm-dd preset query conditions

Copy code 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 Guid in some scenarios

Copy code 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; 

} 