Js_ Case (lights)

<! DOCTYPE HTML > 
< HTML lang = "EN" > 
< head > 
    < Meta charset = "UTF-. 8" > 
    < title > lamp switch </ title > 
</ head > 
< body > 
<-! Introducing two images -> 
< IMG ID = "ON" the src = "IMG / on.gif" > 
< Script > 
    // 1. acquired two images of objects 
    var ON = Document.getElementById("on");
     // 2. Define a determination variable 
    var Fun =  to true ;
     // 3. Binding Events 
    on.onclick =  function () {
         IF (Fun) { 
            on.src = " IMG / on.gif " ; 
            Fun =  to false ; 
        } the else { 
            on.src = " IMG / off.gif " ; 
            Fun =  to true ; 
        } 
    } 



    function F (Fun) { 

    } 
</script>
</body>
</html>