SOURCE

var b = 2;
var cinditoin1 = a > b;
if (conditoin1){

}

if(condition1){
    document.writeln("line 10: a > b: " + conditoin1 + "<br/>");
}
else{
    document.writeln("line 13: a > b: " + conditoin1 + "<br/>");
}

var condition2 = a < b;
if(condition1){
    document.writeln("line 18: a > b: " + conditoin1 + "<br/>");
}
else if(condotion2){
    document.writeln("line 21: a > b: " + conditoin2 + "<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 " + "<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是否为整数
    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;
}

//若15为整数，输出15是整数
isInteger(15);

//若15，15不是整数，输出15，15不是整数
isInteger(15,15);

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

    for(var num = ; num < ; num){
        var unitsDigit = num % 10;
        var tensDigit = parseInt((num / 10) % 10);
        var hundredsDigit = parseInt(num / 100);
        //判断是否为水仙花数；并输出
    }
}