console 命令行工具 X clear

console

var a=5;
var b=3;
if(a>1) document.write("Y"+'<br/>');

if(a>2)
 document.write("T"+'<br/>');
else ;
 document.write("F"+'<br/>');

if(a>=3&&b>=3) document.write(a+b+'<br/>');
else if(a>=3&&b<3) document.write(a-b+'<br/>');
else document.write(a+'<br/>');

if(a>=2){
     if(a>5) document.write("两者都大"+'<br/>');
     else document.write("a大于2，不大于5"+'<br/>');
 }
 else document.write("a既不大于2也不大于5"+'<br/>');

document.write('<br/>------------------------------<br/>');

document.write('<br/>-------------------------////-----<br/>');
var day=3;
var week;
switch(day){
    case 1:
        week="星期一";
    case 2:
        week="星期二";
    case 3:
        week="星期三";
    case 4:
        week="星期四";
    case 5:
        week="星期五";
    case 6:
        week="星期六";
    case 7:
        week="星期日";
        document.write(week+"<br/>");
}



function isInteger(num){
    var result=false;
    //判断是否是整数
    if(parseInt(num)==parseFloat(num)){
      result=true;
    }
     return result;
}
//判断15是否为整数
var num1=15;
if(isInteger(num1)){
    document.write(num1+" is an integer"+"<br/>");
}
else{
    document.write(num1+" is not an integer"+"<br/>");
}
//判断15.15是为整数
var num2=15.15;
if(isInteger(num2)){
    document.write(num2+" is an integer"+"<br/>");
}
else{
    document.write(num2+" is not an integer"+"<br/>");
}


document.write('<br/>-------------------------////-----<br/>');

function isDecimal(num){
    var result=false;
    //判断是否是整数
    if(parseInt(num)!=parseFloat(num)){
      result=true;
    }
     return result;
}
//判断15是否为小数
var num3=15;
if(isDecimal(num3)){
    document.write(num3+" is an Decimal"+"<br/>");
}
else{
    document.write(num3+" is not an Decimal"+"<br/>");
}
//判断15.15是为小数
var num4=15.15;
if(isDecimal(num4)){
    document.write(num4+" is an Decimal"+"<br/>");
}
else{
    document.write(num4+" is not an Decimal"+"<br/>");
}


document.write('<br/>------------------------------<br/>');

//水仙花
function printDaffodlNum(){
    document.write("print the DaffoddNum is "+"<br/>");
    for(var num=100;num<1000;num++){
        var unitsDigit = num % 10;
        var tensDigit = parseInt((num/10)%10);
        var hundredsDigit=parseInt(num/100);
        //如果是水仙花数，则打印
        if(unitsDigit*unitsDigit*unitsDigit+tensDigit*tensDigit*tensDigit+hundredsDigit*hundredsDigit*hundredsDigit==num){
              document.write(num+"<br/>");
        }
    }
};
printDaffodlNum();

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