console 命令行工具 X clear

console

var a = 1;
var b = 2;

var condition1 = a > b;
if (condition1) {
    document.writeln("line 6: a > b: " + condition1 + "<br/>");
}

if (condition1) {
    document.writeln("line 10: a > b: " + condition1 + "<br/>");
}
else {
    document.writeln("line 13: a > b: " + condition1 + "<br/>");
}

var condition2 = a < b;
if (condition1) {
    document.writeln("line 18: a > b: " + condition1 + "<br/>");
}
else if (condition2) {
    document.writeln("line 21: a < b: " + condition2 + "<br/>");
}
else {
    document.writeln("line 24: a is not more than b and not less than b" + "<br/>");
}

a = b;
condition1 = a > b;
condition2 = a < b;

if (condition1) {
    if (condition2) {
        document.writeln("line 33: Wow, there is something wrong." + "<br/>");
    }
    else {
        document.writeln("line 36: a > b: " + condition1 + "<br/>");
    }
}
else {
    if (condition2) {
        document.writeln("line 37: a < b: " + condition2 + "<br/>");
    }
    else {
         document.writeln("line 44: a is not more than b and not less than b" + "<br/>");
    }
}

switch (1) {
    case 1: 
    {
        document.write(1 + "<br/>");
    }
    case 2: 
    {
        document.write(2 + "<br/>");
    }
    break;
    case 3:
    {
        document.write(3 + "<br/>");
    }
    break;
    default:
    {
        document.write("default <br/>");
    }

}

function isInteger(num) {
    var result = false;

    // 判断num是否是整数
    result = (parseInt(num) == parseFloat(num));

    if (result) {
        document.write(num + " is an integer" + "<br/>");
    }
    else {
        document.write(num + " is not an integer" + "<br/>");
    }

    return result;
}

//如果15是整数，输出15是整数
isInteger(15);

//如果15.15不是是整数，输出15.15不是整数
isInteger(15.15);


function printDaffodilNumber() {

    document.write("Print out all daffodil number: " + "<br/>");

    for (var num = 100; num < 1000; ++num) {
        var unitsDigit = num % 10;
        var tensDigit = parseInt((num / 10) % 10);
        var hundredsDigit = parseInt(num / 100);

        //判断是否是水仙花数，并输出
        var sum = Math.pow(unitsDigit, 3) 
                 + Math.pow(tensDigit, 3) 
                 + Math.pow(hundredsDigit, 3);

        if (sum == num) {
            document.write(num + "<br/>");
        }
    }
}

printDaffodilNumber();

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <script>
    </script>
</head>
<body>
    <script>
    </script>
</body>
</html>