Copy code The code is as follows: floatDecimal.html <br>//Retain two decimal places<br>//Function: Round floating point numbers, after the decimal point 2 bits <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>} <br>//The system retains 2 decimal places, such as: 2, and 00 will be added after 2. That is 2.00 <br>function toDecimal2(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>} <BR>function fomatFloat(src,pos){ <BR>return Math.round(src*Math.pow(10, pos))/Math.pow(10, pos); <BR>} <BR>//Rounding<BR>document.writeln("Keep 2 decimal places:" toDecimal(3.14159267) '<br/>'); <br>document.writeln("Force 2 decimal places:" toDecimal2(3.14159267) '<br />'); <br>document.writeln("Retain 2 decimal places:" toDecimal(3.14559267) '<br/>'); <br>document.writeln("Force 2 decimal places:" toDecimal2 (3.15159267) '<br/>'); <br>document.writeln("Keep 2 decimal places: " fomatFloat(3.14559267, 2) '<br/>'); <br>document.writeln( "Keeping 1 decimal place:" fomatFloat(3.15159267, 1) '<br/>'); <br>//Rounding<br>document.writeln("Keeping 2 decimal places: " 1000.003.toFixed( 2) '<br/>'); <br>document.writeln("Keep 1 decimal place: " 1000.08.toFixed(1) '<br/>'); <br>document.writeln(" Keep 1 decimal place: " 1000.04.toFixed(1) '<br/>'); <br>document.writeln("Keep 1 decimal place: " 1000.05.toFixed(1) '<br/>' ); <br>//Scientific notation<br>document.writeln(3.1415.toExponential(2) '<br/>'); <br>document.writeln(3.1455.toExponential(2) '<br/ >'); <br>document.writeln(3.1445.toExponential(2) '<br/>'); <br>document.writeln(3.1465.toExponential(2) '<br/>') ; <br>document.writeln(3.1665.toExponential(1) '<br/>'); <br>//Accurate to n digits, excluding n digits<br>document.writeln("Accurate to the decimal place 2 digits" 3.1415.toPrecision(2) '<br/>'); <br>document.writeln("Accurate to the 3rd decimal place" 3.1465.toPrecision(3) '<br/>'); <br>document.writeln("Accurate to the 2nd decimal place" 3.1415.toPrecision(2) '<br/>'); <br>document.writeln("Accurate to the 2nd decimal place" 3.1455.toPrecision( 2) '<br/>'); <br>document.writeln("Accurate to the 5th decimal place" 3.141592679287.toPrecision(5) '<br/>'); <br></script> ; <BR></head> <br><body> <br>This is my HTML page. <br> <br></body> <br></html> <br> </div> <br><br> <p><strong>Javascript rounds to two decimal places </strong></p> <p></p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="1769" class="copybut" id="copybut1769" onclick="doCopy('code1769')"><u>Copy code</u></a></span> The code is as follows:</div> <div class="codebody" id="code1769"> <br>function count(){<br> //alert( "count");<br> var size=~~(document.getElementById("size").value);<br> var value=0;<br> for(var i=0;i<size;i ) {<br> var val=1*(document.getElementById("afterAdjScor" i).value);<br> if(null!=val){<br> value =Math.round((1*(value val) )*100)/100;<br> }<br> }<br> if(isNaN(value)){<br> value="The input must be a numeric type";<br> }<br> document.getElementById( "total").value=value;<br> }<br> </div> <p>Description:~~XX: String to int<br> 1*XX: String to float<br> Math.round((1*(value val))*100)/100: Rounding</p>
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