JS整数与浮点数的转换

moyqsky 2010-12-28

展开全文

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www./TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www./1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>整数与浮点数的转换</title>
</head>

<body>
<script language="javascript" type="text/javascript">
document.write("整数转换函数：parseInt(数据,底数) ");
document.write("10101=>" + parseInt("10101",2)+" ");
document.write("77=>" + parseInt("77",8)+" ");
document.write("2A3B=>" + parseInt("2A3B",16)+" ");
document.write("077=>" + parseInt("077")+" ");
document.write("0X2A3B=>" + parseInt("0X2A3B")+" ");
document.write("浮点数转换函数：parseFloat(数据) ");
var str = "12.345";
var str1 = str + 6;
var str2 = parseFloat(str) + 6;
document.write(str1 + "=>" + parseFloat(str1)+" ");
document.write(str1 + "=>" + parseFloat(str2)+" ");
document.write("34.89a23=>" + parseFloat("34.89a23")+" ");
document.write("数字判断函数：isNaN ");
document.write("4是数字："+!isNaN(4)+" ");
document.write("ffff是数字:"+!isNaN("ffff")+" ");
</script>
</body>
</html>

输出：

整数转换函数：parseInt(数据,底数)
10101=>21
77=>63
2A3B=>10811
077=>63
0X2A3B=>10811
浮点数转换函数：parseFloat(数据)
12.3456=>12.3456
12.3456=>18.345
34.89a23=>34.89
数字判断函数：isNaN
4是数字：true
ffff是数字:false