s = "Hello " + name;             

counter ++;            

window.close();                       

{
  x = Math.PI;
  cx = Math.cos(x);
  alert("cos(" + x + ") = " + cx);
}

if (expression)
    statement;

if (username == null)
   username = "Jo Smith";

if (expression)
   statement1;
else
     statement2;

if(username != null)
   alert("Hello " + username);
else
{
   username = prompt("Welcome !\n What is your name ?");
   alert("Hello " + username);
}

i = j =1;
k = 2;
if(i == j)
   if(j == k)
        document.write(" i doesn’t equal k");
else
        document.write(" i doesn’t equal j");

if(i == j)
{
   if(j == k)  
        document.write(" i doesn’t equal k");
   else    
        document.write(" i doesn’t equal j");
}

if(i == j)
{
   if(j == k)
   {  
     document.write(" i doesn’t equal k");
   } 
} 
else
{ 
  document.write(" i doesn’t equal j");    
}

if( n == 1){
     //execute code block #1
}
if( n == 2){
     //execute code block #2
}
if( n == 3){
     //execute code block #3
}
 else{
     //if all other has failed, execute bloch #4
}

switch(expression)
{
   statements;
}

switch(n)
{
   case 1:                    // start here if n == 1
          // execute code block #1
          break;
   case 2:                    // start here if n == 2

          // execute code block #2 
          break;
   case 3:                    // start here if n == 3    

         // execute code block #3
         break;
   default :
         // execute code block #4
         break;
}

case 0:
case 60*06*24 :
case "hello" :
case "Hello " + "world" :

while(expression)
   statement;

while(true);

count = 0;
while(count < 10)
{
   document.write("count + "<br>");
   count++;
}

do
  statement;
while(expression);

var i = 0;
do
   document.write( i + "<br>");
while( ++i < 3);

for( initialize ; test ; update)
   statement;

initialize ;
while(test)
{
   statement;
   update;
}

for(count = 0; count <10; count++)
   document.write(count + <br>");

for(i = 0, j = 10; i < 10; i++, j --)
   sum += i * j;

for (אובייקט  in   משתנה) 
      הצהרה ;  

for(  prop in my_object )
{
   document.write("name: " + prop + "; value: " + my_object[prop], "<br>");
}

break  labelname;

for ( i = 0; i < a.length; i++)
{
   if (a[i] == target)
    break;
}

continue  labelname; 

for( i = 0; i < data.length; i++)
{
  if(data[i] == null)
      continue;
 total += data[i];
}

function square(x) 
{ return x*x; }

function display_object(obj) 
{
   if (obj == null) return;
}

with(אובייקט)
  ביטוי/הצהרה;

with(frames[1].document.forms[0]) 
{
   name.value = "";
   address.value = "";
}

for(i=0; i < a.length; a[i++]);

for( (a == 0) || (b == 0) );
     o = null;

for( i = 0; i < a.length; a[i++] = 0) /*empty */