mouse-updown.js

这是《JavaScript学习源代码》一书的源代码

// a function to react to MOUSEDOWN and MOUSEUP events 

function light(n)
{   
  var pic = document.getElementById("bulb");
  var box = document.getElementById("txt"); 
                                
  if( n == 1 )
  {                   
    pic.src = "on.gif";
    box.value = "Button is Down"; 
  }           
  if( n == 0 )
  {                   
    pic.src = "off.gif";
    box.value = "Button is Up"; 
  }
}