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<title>整數(shù)與浮點數(shù)的轉(zhuǎn)換</title>
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<script language="javas
document.write("整數(shù)轉(zhuǎn)換函數(shù)：parseInt(數(shù)據(jù),底數(shù))<br>");
document.write("10101=>" + parseInt("10101",2)+"<br>");
document.write("77=>" + parseInt("77",8)+"<br>");
document.write("2A3B=>" + parseInt("2A3B",16)+"<br>");
document.write("077=>" + parseInt("077")+"<br>");
document.write("0X2A3B=>" + parseInt("0X2A3B")+"<br>");
document.write("浮點數(shù)轉(zhuǎn)換函數(shù)：parseFloat(數(shù)據(jù))<br>");
var str = "12.345";
var str1 = str + 6;
var str2 = parseFloat(str) + 6;
document.write(str1 + "=>" + parseFloat(str1)+"<br>");
document.write(str1 + "=>" + parseFloat(str2)+"<br>");
document.write("34.89a23=>" + parseFloat("34.89a23")+"<br>");
document.write("數(shù)字判斷函數(shù)：isNaN<br>");
document.write("4是數(shù)字："+!isNaN(4)+"<br>");
document.write("ffff是數(shù)字:"+!isNaN("ffff")+"<br>");
</script>
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輸出：
整數(shù)轉(zhuǎn)換函數(shù)：parseInt(數(shù)據(jù),底數(shù))
10101=>21
77=>63
2A3B=>10811
077=>63
0X2A3B=>10811
浮點數(shù)轉(zhuǎn)換函數(shù)：parseFloat(數(shù)據(jù))
12.3456=>12.3456
12.3456=>18.345
34.89a23=>34.89
數(shù)字判斷函數(shù)：isNaN
4是數(shù)字：true
ffff是數(shù)字:false
