jQuery烂笔头

Specify a function to execute when the DOM is fully loaded.

$(document).ready(function () {
  $("p").text("The DOM is now loaded and can be manipulated.");
});

--为button添加/删除disabled属性

$('#btnCancel').attr('disabled','true');

$('#btnCancel').removeAttr('disabled');


Img

<img id="my_image" src="first.jpg"/>

Then you can change the src in jQuery by:

$("#my_image").attr("src","second.jpg");

To attach this to an onclick event, you could write:

$("#my_image").bind("click", function() {
      $("#my_image").attr("src","second.jpg");
});

To rotate the image, you could do this:

    $("img").bind("click", function() {
      var src = ($(this).attr("src") === "img1_on.jpg")
                    ? "img2_on.jpg" 
                    : "img1_on.jpg";
      $(this).attr("src", src);

servlet会缓存img的URL，当请求的url不变时，servlet会把缓存的url对应的图片传回来，所以图片没有被正确设置。可以每次请求时可以在url上多加上当期时期，这个每次请求的url就不同了

$('#imgCaptcha').attr(
		{
          src: '<workdesk:jspURL source="/process/SYSTEM/Captcha"/>?time='+now.getTime(),
          title: "Captcha",
          alt: "Click me"
        }
	);

$("#id").css('display','none');
$("#id").css('display','block');
//or
$("#id")[0].style.display = 'none';

$("#id").show(); //display:block
$("#id").hide(); //display:none
$("#id").toggle(); //切换元素的可见状态:如果元素可见，切换为隐藏；如果元素隐藏，切换为可见