jquery Determines whether the check box is selected method _jquery

The jquery decision check box is checked and how to select the question to do a summary.
To get to the point, or when the page is like the next set of check boxes:

<input type= "checkbox" name= "fruit" value= "apple"/> Apples <input 
type= "checkbox" name= "fruit" value= "orange "/> Orange 
<input type=" checkbox "name=" fruit "value=" banana "/> Banana 
<input type=" checkbox "Name=" fruit "Value=" Grape "/> Grapes 

Then use Jquery to get the values of a set of checkboxes for Name=fruit as follows:

var checkval= '; 
$ ("Input[name= ' fruit ']:checkbox"). each (the function () { 
  if ($ (this). attr (' checked ')) { 
    checkval+=$ (.). Val ( )+','; 
  } 
}) 
Determine if the check box for the Name=fruit group has the selected option:
var flag=false; 
$ ("Input[name= ' fruit ']:checkbox"). each (function () { 
  if ($ (this). attr (' checked ')) { 
    flag=true; 
  } 
}) 
if (flag) { 
  alert (' has been selected '); 
} else{ 
  alert (' No options selected '); 
} 

The above is the jquery check box is selected method, I hope to learn some help, but also useful JS get, please refer to the "JS Judge check box is selected instance"