切换布局
显示结果
<html> <head> <title>JavaScript toPrecision() Method </title> </head> <body> <script type = "text/javascript"> var num = new Number(7.123456); document.write("num.toPrecision() is " + num.toPrecision()); document.write("<br />"); document.write("num.toPrecision(4) is " + num.toPrecision(4)); document.write("<br />"); document.write("num.toPrecision(2) is " + num.toPrecision(2)); document.write("<br />"); document.write("num.toPrecision(1) is " + num.toPrecision(1)); </script> </body> </html>
