console 命令行工具 X clear

console

var globalVariable1 = 0;


//打印localVariable1

//打印localVariable2

function test1(){
    //document.write(globalVariable1 +"<br/>");
    var localVariable1 = 2;
    //打印localVariable1
   document.write(globalVariable1 +"<br/>");
    //打印localVariable1  
    document.write(globalVariable1+"<br/>");
}

document.write(globalVariable2 +"<br/>");
test1();

var globalVariable2= 1;
function test2(){
    var localVariable2 = 3;
    //打印localVariable1
   //document.write(globalVariable1+"<br/>");
}
test2();

//打印localVariable2  
//document.write(globalVariable2+"<br/>");
//打印localVariable1
 document.write(globalVariable1+"<br/>");



  function welcomeMes(){
      alert("Welcome");
  }
function add(left, right){
      return left + right;
}
document.write((add(1,2)+3)+"<br/>");

function isLeapYear(year){
    //判断是否有闰年
    if(year%4==0&&year%100!=0||year%400==0){
        document.write(year+"年为闰年"+"<br/>");
        }else{
            document.write(year+"年不是闰年"+"<br/>");
        }
}
//打印2020 2000 2001 是否闰年

isLeapYear(2000);
isLeapYear(2020);
isLeapYear(2001);

document.write("----------------"+"<br/>");

var x=1,y=3,a=8,b=2;
function maxnumber1(){
    var max;
    if(x<y){
        max=y;
    }else{
        max=x;
    }
    if(max<a){
        max=a;
    }
    if(max<b){
        max=b;
    }
    return max;
}
document.write("最大值为："+maxnumber1()+"<br/>");
document.write("..........................."+"<br/>");
//定义两个函数，他们的功能分别是求出任意五个数中的最大值和最小值
var num1=9,num2=50,num3=16,num4=80,num5=70;
//求出五个数最大值
function maxnumber2(){
    var max1;
  if(num1<num2){
      max1=num2;
  }else{
      max1=num1;
  }
  if(max1<num3){
      max1=num3;
   }
   if(max1<num4){
       max1=num4;
   }
   if(max1<num5){
     max1=num5;
   }
   return max1;
}
document.write("最大值为："+maxnumber2()+"<br/>");
//求出五个数最小值
function minnumber(){
    var min;
    if(num1>num2){
        min=num2;
    }else{
         min=num1;
    }
    if(min>num3){
        min=min3;
    }
    if(min>num4){
         min=num4;
    }
    if(min>num5){
        min=num5;
    }
    return min;
}
document.write("最小值："+minnumber()+"<br/>");


document.write("..........................."+"<br/>");



var welcomeString="welcome";

document.write(welcomeString+"<br/>");
document.write(welcomeString.length+"<br/>");
document.write(welcomeString.toLowerCase()+"<br/>");
document.write(welcomeString.toUpperCase()+"<br/>");

document.write(welcomeString.charAt(2)+"<br/>");
document.write(welcomeString.charAt(6)+"<br/>");
document.write(welcomeString.substring(3)+"<br/>");
document.write(welcomeString.substring(0,2)+"<br/>");



var sentence = "We have fun in our class.Do you have fun in class?"
document.write(sentence+"<br/>");
document.write(sentence.replace("class","programming  class")+"<br/>");
document.write(sentence.replace(/class/g,"programming  class")+"<br/>");

var splitSentence ="We have fun in our class";
document.write(splitSentence+"<br/>");
document.write(splitSentence.split("")+"<br/>");
document.write(welcomeString+"<br/>");
document.write(welcomeString.split("")+"<br/>");
document.write(sentence.split("")+"<br/>");

document.write(sentence.indexOf("class")+"<br/>");
document.write(sentence.lastIndexOf("class")+"<br/>");
document.write(sentence.match("class")+"<br/>");
document.write(sentence.match(/class/g)+"<br/>");
document.write(sentence.search(/class/g)+"<br/>");


document.write('<br/>---------------------------------<br/>');
function countNumber(stringtoCount) {

    var numCount = 0;

     for(var i=0;i<stringtoCount.length;++i)
    {
        var char = stringtoCount.charAt(i);
                //isNaN()对空格字符会转化为0，需要加个判断charAt(i)不能为空格
                if (char != " " && !isNaN(char)) {
                    document.write(true);
                   // numCount++;
                }else{
                    document.write(false);
                }
            }

     return numCount;
}
//document.write("字符串中含有" +countNumber("3h4e4g9k8o")+"个数字");

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