Home > Developer > JavaScript
The BS brother knows about Js. We will have to deal with JS when we engage in BS. Not necessarily. JS is not enough. In some cases, JavaScript is inseparable. In form forms, decimals are sometimes reserved. The exact number of decimal places. The following methods can help us achieve this. </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <title> floatdecimal.html </title> </P> <p> <meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <meta http-equiv =" Content-Type" content = "text/html; charset = UTF-8 "> <br/> <SCRIPT type =" text/JavaScript "> <br/> // retain two decimal places <br/> // function: round a floating point number, 2 digits after the decimal point <br/> function todecimal (x) {<br/> var F = parsefloat (x); <br/> If (isnan (f )) {<br/> return; <br/>}< br/> F = math. round (x * 100)/100; <br/> return F; <br/>}</P> <p> // The system retains two decimal places, such as: 2, 00 will be added after 2. that is, 2.00 <br/> function todecimal (x) {<br/> var F = parsefloat (x); <br/> If (isnan (f )) {<br/> return false; <br/>}< br/> var F = math. round (x * 100)/100; <br/> var S = f. tostring (); <br/> var rs = S. indexof ('. '); <br/> If (RS <0) {<br/> rs = S. length; <br/> S + = '. '; <br/>}< br/> while (S. length <= Rs + 2) {<br/> S + = '0'; <br/>}< br/> return S; <br/>}</P> <p> function fomatfloat (SRC, POS) {<br/> return math. round (SRC * Math. pow (10, POS)/math. pow (10, POS); <br/>}< br/> // rounding <br/> alert ("retain 2 decimal places:" + todecimal (3.14159267 )); <br/> alert ("forcibly retain 2 decimal places:" + todecimal (3.14159267); <br/> alert ("retain 2 decimal places: "+ todecimal (3.14559267); <br/> alert (" force keep 2 decimal places: "+ todecimal (3.15159267 )); <br/> alert ("retain 2 decimal places:" + fomatfloat (3.14559267, 2); <br/> alert ("retain 1 decimal places:" + fomatfloat (3.15159267, (1); </P> <p> // five homes and six homes <br/> alert ("retain 2 decimal places:" + 1000.003.tofixed (2 )); <br/> alert ("retain 1 decimal point:" + 1000.08.tofixed (1); <br/> alert ("retain 1 decimal point:" + 1000.04.tofixed (1 )); <br/> alert ("retain 1 decimal point:" + 1000.05.tofixed (1 )); </P> <p> // scientific count <br/> alert (3.1415.toexponential (2); <br/> alert (3.1455.toexponential (2 )); <br/> alert (3.1445.toexponential (2); <br/> alert (3.1465.toexponential (2); <br/> alert (3.1665.toexponential (1 )); <br/> // precise to N digits, excluding n digits <br/> alert ("precise to 2nd decimal places" + 3.1415.toprecision (2 )); <br/> alert ("accurate to 3rd decimal places" + 3.1465.toprecision (3); <br/> alert ("accurate to 2nd decimal places" + 3.1415.toprecision (2 )); <br/> alert ("accurate to 2nd decimal places" + 3.1455.toprecision (2); <br/> alert ("accurate to 5th decimal places" + 3.141592679287.toprecision (5 )); <br/> </SCRIPT> </P> <p> </pead> </P> <p> <body> <br/> This Is My HTML page. <br> <br/> </body> <br/> </ptml> <br/>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
