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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p id="demo">单击按钮不保留小数位</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var num = 5.56789; var x = document.getElementById("demo"); x.innerHTML=num.toFixed(); } </script> </body> </html>
运行结果
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