html里怎么整数转成浮点数,JS整数与浮点数的转换

整数与浮点数的转换

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")+"
");

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