Javascript change Div style

Question

I want that part 1 onclick div style changes and part 2 again on click it comes back to normal. I tried doing so but I failed to achieve the

Answer 1

you may check the color before you click to change it.

function abc(){
     var color = document.getElementById("test").style.color;
     if(color==''){
         //change
     }else{
         //change back
     }
}