console 命令行工具 X clear

console

var number1=22;
var number2=33;
var myString='Heather';

var sum=number1+number2;
document.write(sum+'<br/>');

var sumString=number1+myString;
document.write(sumString+'<br/>');

var stringSum=myString+number2;
document.write(stringSum+'<br/>');

var stringNum=number1+"";

var stringNumSum=stringNum+number2;
document.write(stringNumSum+'<br/>');

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
        var number = 3;
        var a;
        var myString='Header';
        var noSpace=null;
        var isReal=true;

        document.write(number+'<br/>');
        document.write(a+'<br/>');
        document.write(myString+'<br/>');
        document.write(noSpace+'<br/>');
        document.write(isReal+'<br/>');
    </script>
</head>
<body>
</body>
</html>