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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字方法</h2> <p>toPrecision() 方法返回一个字符串，其中包含一个指定长度的数字：</p> <p id="demo"></p> <script> var x = 9.656; document.getElementById("demo").innerHTML = x.toPrecision() + "<br>" + x.toPrecision(2) + "<br>" + x.toPrecision(4) + "<br>" + x.toPrecision(6); </script> </body> </html>