JS (a)

The loop is still very interesting:

1) Security Number of operations:

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Number of security</title></Head><Body>    <Scripttype= "Text/javascript">     for(varI= 1; I<= -; I++)    {        if(i%7!=0 &&I%Ten!=7) {document.write (i+" "); }    }    </Script></Body></HTML>

2) 0.01 mm of paper folded 30 times will be a terrible:

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Document</title></Head><Body>    <Scripttype= "Text/javascript">        varJ= 0.01;  for(varI= 1; I<= -; I++) {J*= 2; } document.write (J/1000+ "M");        /*var j = 0.01;               var i = 0; while (j<=1000) {J *= 2;//statement i++} document.write (i);*/    </Script></Body></HTML>

3) The maximum and minimum values in 7 numbers and the corresponding subscripts:

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>haha haha haha</title></Head><Body>    <Scripttype= "Text/javascript">    vararr= [Ten, -, *, the,2, -,7]; varMax=arr[0]; varmin=arr[0]; varMaxindex,minindex;  for(varI= 0; I< 7; I++){        if(Max<Arr[i]) {Max=Arr[i]; Maxindex=i; }        if(min>Arr[i]) {min=Arr[i]; Minindex=i; }} document.write (Max+' '+Maxindex+"<br>"+min+" "+Minindex); </Script></Body></HTML>

JS (a)