数据类型

游鹄君2025年4月30日小于 1 分钟
示例代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>js type</title>
</head>
<body>
  <script type="text/javascript">
    // boolean
    var a=true;
    console.log(a);
    console.log(typeof(a));
    var b=false;
    console.log(b);
    console.log(typeof(b));
    //string
    var c="just do it ";
    alert(c);
    console.log(typeof(c));
    //number
    var d=100;
    console.log(d);
    console.log(typeof(d));
    var e=3.14;
    console.log(e);
    console.log(typeof(e));
    var f=023;
    console.log(f);
    console.log(typeof(f));
    var g=0x2a;
    console.log(f);
    console.log(typeof(f));
    var h=2.5e2;
    console.log(h);
    console.log(typeof(h));
    var i=NaN;
    console.log(i);
    console.log(typeof(i));
 
    //object
    var obj =new Object();
    console.log(obj);
    console.log(typeof(obj));
 
    var arr=new Array();
    console.log(arr);
    console.log(typeof(arr));
 
    var nn=null;
    console.log(nn);
    console.log(typeof(nn));
 
    //function
    function func()
    {
     alert('01234567879');
    }
 
    func();
 
    var into=function()
    {
     console.log('ifuleyou');
    }
 
    into();
 
    //undefined
    var j=undefined;
    console.log(j);
    console.log(typeof(j));
 
 
  </script>
</body>
</html>