原型——round() 方法
此方法将数字舍入为最接近的整数。
语法
number.round();
返回值
将数字舍入为最接近的整数。
示例
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showResult() { alert( "Math.round(4.5) : " + Math.round(4.5) ); alert( "(4.5).round() : " + (4.5).round() ); alert( "(4.49).round() : " + (4.49).round() ); alert( "(-4.5).round() : " + (-4.5).round() ); } </script> </head> <body> <p>Click the button to see the result.</p> <br /> <br /> <input type = "button" value = "Result" onclick = "showResult();"/> </body> </html>
输出
prototype_number_processing.htm
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