JS实现的进制转换，浮点数相加，数字判断操作示

<script>
document.write("整数转换函数parseInt(数据,底数)<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("浮点数转换函数parseFloat(数据)<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("数字判断函数isNaN<br>");
document.write("4是数字"+!isNaN(4)+"<br>");
document.write("ffff是数字:"+!isNaN("ffff")+"<br>");
</script>