When I learned the "checkbox application", I found that the code is running on the FF. I don't think it is a browser. Later, I will change to IE, and I will find it online because it is because of it. Attr () should be replaced to prop () so that it can be displayed normally. The code is as follows:

Is your hobby?
		 <Input Type = "CheckBox" name = "items" value = "football" />
		 <input type = "checkbox" name = "items" value = "Basketball" />
		 <Input Type = "CheckBox" name = "items" value = "badminton" />
		 <Input Type = "Checkbox" name = "items" value = "Table Tennis" />
		 <Input Type = "Button" ID = "Checkedall" Value = "All Choice" />
		 <Input Type = "Button" ID = "CheckedRev" Value = "Reverse Selection" />
		 <Input Type = "Button" ID = "Checkedno" Value = "All Non-selected">
		 <Input Type = "Button" ID = "Send" value = "Submit" />
	</form> 
	<script type="text/javascript">
		$("#checkedAll").click(function(){
			$('[name=items]:checkbox').prop('checked',true);
		 		});//select all 
		$("#checkedNo").click(function(){
			$('[name=items]:checkbox').prop('checked',false);
		 		});//unselect all 
		$("#checkedRev").click(function(){
			$('[name=items]:checkbox').each(function(){
				this.checked=!this.checked;
			})
		 }); // Reverse
		 // replace attr () with prop ();
		$("#send").click(function(){
			 Var str = "You selected: \ r \ n";
			$('[name=items]:checkbox:checked').each(function(){
				str+=$(this).val()+"rn";
			});
			alert(str);
		 }); // Submit the output content
		 // checkbox application
	</script> 

Now why now?

In previous jQuery versions, use attr () to get the properties of the object, such as taking an ALT property of a picture, is $ ("# img"). Attr ('alt'); however, such as: disabled = "disabled" Different in different browsers are different; so from jQuery1.6, use PROP () to get standard properties: true / false; then $ "# checkbox"). Prop ('checked') will only return true / false without returning "disabled" or "";

Principles with prop ():

1. Only the property name property will take effect immediately, such as SelectedIndex, Tagname, Nodename, Nodetype, OwnerDocument, defaultchecked, and defaultselected;
   2. There is only the property of true / false, that is, the attribute is only the properties of the Boolean value;