Application of the For loop in JavaScript

1. There is a chessboard, there are 64 squares, in the first box to put 1 sesame seed weight is 0.00001kg, the second inside put 2, the third inside put 4, the board on the weight of all sesame

<script>var sum=0;  // The first weight is set at 0;  for (i=1;i<=64;i++) {    var a=1;               // starting at 2 of the 0-time  square     for (j=0;j<i-1;j++)      {        a=a*2;            }    Sum=sum+A;} Alert (0.00001*sum)

2. Badminton racket 15 yuan, ball 3 yuan, water 2 yuan. $200 each at least one, how much could it be

 var  cs=0; //  var  str= ";  for  (i=1;i<=13;i++) //  Each one must have at least one, so start looping from 1  { for  (j=1;j<=66;j++" { for  (N=1;n<=100;n++ =15*i+3*j+2*n;  if  (Sum==200                +=1; STR  +=i+ "Badminton Racket" +j+ "ball" +n+ "bottle of Water" + "| |" }}}}alert (CS) alert (str)  

3 100 or less of 7 related

var str= "";  for (i=0;i<=100;i++) {   if(i%7==0| | i%10==7| | parseint (i%10) ==7)   {      str=str+i+ "| |"    }}alert (str)

Application of the For loop in JavaScript