For floating point numbers with multiple digits after decimal points, we may only need to retain two digits, but JS does not provide such a direct function. Therefore, we have to write the function to implement this function by ourselves. The Code is as follows:
Function changetwodecimal (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;
Return f_x;
}
Function: rounds a floating point number to the second place after the decimal point.
Usage: changetwodecimal (3.1415926) returns 3.14
Changetwodecimal (3.1475926) returns 3.15
JS retains 2 decimal places (mandatory)
If the number of decimal places is greater than 2 digits, it is okay to use the above function, but if it is smaller than 2 digits, for example:
Changetwodecimal (3.1) will return 3.1. If you need a format like 3.10, you need the following function:
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;
}
Function: rounds a floating point number to two digits after the decimal point. If there are less than two digits, the value is 0. This function returns the string format.
Usage: changetwodecimal (3.1415926) returns 3.14
Changetwodecimal (3.1) returns 3.10
In addition:
Parsefloat MethodReturns the floating point number converted from a string.
parseFloat(numString)
RequiredNumstringThe parameter is a string containing floating point numbers.
DescriptionParsefloatMethod return andNumstringThe number that is saved in the bucket is equal to the number that is saved in the bucket. IfNumstringIf the prefix cannot be interpreted as a floating pointNan(Not a number ).
parseFloat("abc")//ReturnNaN.parseFloat("1.2abc")//Return1.2.
AvailableIsnanMethod detectionNan.
Example 1:
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT>
Function changettext (){
Document. getelementbyid ("txtb"). value = Document. getelementbyid ("txta"). value;
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: textbox id = "txta" runat = "server" onblur = "changettext ()"> </ASP: textbox>
<Asp: textbox id = "txtb" runat = "server"> </ASP: textbox>
</Div>
</Form>
</Body>
</Html>
Example 2:
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT>
// Save the value as a three-digit valid value
Function changethreedecimal_f (varobj)
{
VaR x = varobj. value;
VaR f_x = parsefloat (X );
If (isnan (f_x ))
{
Return;
}
F_x = math. Round (f_x * 1000)/1000;
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 + 3)
{
S_x + = '0 ';
}
Varobj. value = s_x;
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: textbox id = "txta" runat = "server" onblur = "changethreedecimal_f (this)"> </ASP: textbox>
<Asp: textbox id = "txtb" runat = "server"> </ASP: textbox>
</Div>
</Form>
</Body>
</Html>
For floating point numbers with multiple digits after decimal points, we may only need to retain two digits, but JS does not provide such a direct function. Therefore, we have to write the function to implement this function by ourselves. The Code is as follows:
Function changetwodecimal (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;
Return f_x;
}
Function: rounds a floating point number to the second place after the decimal point.
Usage: changetwodecimal (3.1415926) returns 3.14
Changetwodecimal (3.1475926) returns 3.15
JS retains 2 decimal places (mandatory)
If the number of decimal places is greater than 2 digits, it is okay to use the above function, but if it is smaller than 2 digits, for example:
Changetwodecimal (3.1) will return 3.1. If you need a format like 3.10, you need the following function:
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;
}
Function: rounds a floating point number to two digits after the decimal point. If there are less than two digits, the value is 0. This function returns the string format.
Usage: changetwodecimal (3.1415926) returns 3.14
Changetwodecimal (3.1) returns 3.10
In addition:
Parsefloat MethodReturns the floating point number converted from a string.
parseFloat(numString)
RequiredNumstringThe parameter is a string containing floating point numbers.
DescriptionParsefloatMethod return andNumstringThe number that is saved in the bucket is equal to the number that is saved in the bucket. IfNumstringIf the prefix cannot be interpreted as a floating pointNan(Not a number ).
parseFloat("abc")//ReturnNaN.parseFloat("1.2abc")//Return1.2.
AvailableIsnanMethod detectionNan.
Example 1:
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT>
Function changettext (){
Document. getelementbyid ("txtb"). value = Document. getelementbyid ("txta"). value;
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: textbox id = "txta" runat = "server" onblur = "changettext ()"> </ASP: textbox>
<Asp: textbox id = "txtb" runat = "server"> </ASP: textbox>
</Div>
</Form>
</Body>
</Html>
Example 2:
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT>
// Save the value as a three-digit valid value
Function changethreedecimal_f (varobj)
{
VaR x = varobj. value;
VaR f_x = parsefloat (X );
If (isnan (f_x ))
{
Return;
}
F_x = math. Round (f_x * 1000)/1000;
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 + 3)
{
S_x + = '0 ';
}
Varobj. value = s_x;
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: textbox id = "txta" runat = "server" onblur = "changethreedecimal_f (this)"> </ASP: textbox>
<Asp: textbox id = "txtb" runat = "server"> </ASP: textbox>
</Div>
</Form>
</Body>
</Html>
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