console 命令行工具 X clear

console

var num1 = 22;
var num2 = 33;
var str = "hea";

var sum = num1 + num2;
document.write(sum + "<br/>");

var sam = num1 + str;
document.write(sam + "<br/>");

var sbm = str + num2;
document.write(sbm + "<br/>");

var scm = num1 + "";
var cdm = scm + num2;
document.write(cdm + "<br/>");

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
        var a = 10;
        var b;
        var c = 'heat';
        var d = null;
        var e = true;
        document.write(a+'<br/>');
        document.write(b+'<br/>');
        document.write(c+'<br/>');
        document.write(d+'<br/>');
        document.write(e+'<br/>');
    </script>
</head>
<body>
</body>
</html>