js The logical thought of the circular statement in and python Similar to , It's just that the writing is different , Pay attention to the standardization of writing format .

One : seek 1-100 The sum of all primes between , And average value

var sum = 0;

var pingjun = 0;

for(var i = 0; i <= 100;i++){

     sum = sum + i;

     if (i == 100){

         pingjun = sum /i;

   }

}

   document.write(" and “+sum + " average ”+ pingjun

Two : seek 1-100 The product of all numbers between

<script type="text/javascript">
   var product = 1;
   for(var i =1;i<= 100;i++){
    product *= i;
   #  be careful *=
    
   }
   document.write(product);
   
  
   
   
  </script>

Three ; seek 1-100 Between can be 3 All divisible numbers

<script type="text/javascript">
   var sum = 0;
   for(var i =0;i<= 100;i++){
    if (i%3 == 0){
     sum += i;
     
     
    }
   }
   document.write(sum);

Four ; seek 1-100 Between all odd numbers Even sum

var jijisum = 0;
   var dabosum = 0;
   for(var i = 0;i<= 100;i++){
    if(i%2 == 0){
     dabosum += i;
     
    }else{
     jijisum += i;
    }
   }
   document.write(jijisum,dabosum);
   

Five ; seek 200-300 Sum of all odd numbers between , requirement use continue

<script type="text/javascript">
   var sum = 0;
   for(var i > 200;i <= 300;i++){
    if (i%2 == 0){
     continue;
   }
    sum += i;
    
   }
   document.write(sum);
  </script>

Six ; Realization of fibolache sequence 1 1 2 3 5 8 13 21     characteristic : Every first two numbers add up to make the third number , The first two The number is special , Start with the third number .

<script type="text/javascript">
   var num1 = 1;
   var num2 = 1;
   var sum = 0;
   for(var i=0;i<5;i++){
    sum = num1 + num2;
    num1 = num2;
    num2 = sum;
    
   }
   document.write(sum);
   sum = sum.toString();
   document.write(sum);
  </script>

Seven ; Calculate the return on bank deposits , principal 10000, The interest rate is three per thousand ,5 Earnings after year ( principal + interest )

<script type="text/javascript">
   var money = 1000;
   var sum_Money = sum_Money*1.003;
   for(var i=0;i<=5;i++){
    sum_Money *= 1.003
    
    
   }
   document.write(sum_Money);
  </script>

Eight ; Print square    *   be careful : Value of initial value of loop ,i=0,i<5, loop 6 second , Printing 6 That's ok 6 column *

script type="text/javascript">
   for(var i=0;i<=5;i++){
    for(var j =0;j <= 5;j++){
     document.write("*");
    }
   
   document.write("<br />");
   }
  </script>

Nine ; Print triangle *

*
**
***
****

<script type="text/javascript">

# stay for Loop defined variable , Internal can be used directly
   var i =1;
   var j =1;

   for ( i=1;i<=4;i++){
    for ( j=1;j<=i;j++){
     document.write("*");     
    }
    document.write("<br />");  
   }
   
  </script>

   *
  **
 ***
****

<script type="text/javascript">

# Define the number of cycles loop_times, Increase code readability
   var loop_times = 4;
for (var i = 1; i <= loop_times; i++){
for (var j = 1; j <= loop_times-i;j++){
document.write(" ");

}
for (var k= 0; k < i; k++){
document.write("*");
}
document.write("<br/>");

}
</script>

   var loop_times = 4;
   for (var i = 1; i <= loop_times; i++){
    for (var j = 1; j <= loop_times-i;j++){
     document.write(" ");
     
   }
   for (var k= 0; k < i; k++){
    document.write("*");
   }
   document.write("<br/>");
   
  } 
  </script>

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