checkbox-poll.js

这是《JavaScript学习源代码》一书的源代码

// a function to discover which checkboxes are selected
function checkbox_poll()
{                                      
  // create a string for the results
  var str = "Color choice is ";                    
  
  // loop through the checkboxes
  for( var i=1; i<4; i++ )
  {                             
    // if the checkbox is checked, add its value
    if( eval("window.document.forms.f.chk"+i+".checked") )
     str += eval("window.document.forms.f.chk"+i+".value+' '");
  }      
  // display the results
  alert( str ); 
}