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Note that the dynamic loading JS code here is for the following situations: The code is as follows Copy Code Back to the point, then how to determine whether the current page loaded jquery? In the JS code, if jquery is loaded, the jquery () function is defined, so just check to see if the jquery () method is defined (here is not the $ () method because more than jquer

moves over an existing picture. In order to preload this file faster, we simply created a new image () object named Heavyimage, and then loaded it into the page synchronously via the onload () event handle. Note that the label (tag) itself does not handle onmouseover () and onmouseout () events, which is why the tags in the above example are included in the Load multiple pictures through an array (arrays) In reality, you'll probably need t

There are many articles on the Internet to determine whether the picture has been loaded, but some browsers are not suitable, the following small section to share some of the JavaScript to determine whether the picture has been loaded complete method summary, the specific content as follows:One. OnLoad EventBy listening to the OnLoad event of the image, it is possible to determine whether the picture has be

JavaScript implements 3 ways to determine whether a picture is loaded or not Sometimes we in the front-end development work in order to obtain the information of the picture, we need to be loaded after the picture is completed before the image can be correctly obtained size, and the corresponding callback function to make the picture to produce some kind of display effect. This paper mainly deals w

Sometimes you need to get the size of the picture, which needs to be done after the picture is loaded. There are three ways to achieve it, as described below. First, the Load event Copy Code code as follows: Test, all browsers display "loaded", which means that all browsers support the IMG Load event. Ii. ReadyStateChange Incident Copy Code code as follows:

The effect can look directly at the classification of Taobao products page, as well as QQ Mall page Related address: Taobao Mall shows If you use Firebug to view it, you will find that when you scroll to the corresponding row, the current line of the picture is loaded immediately, such as the page in the open only add visual area of the picture, while other hidden pictures are not loaded, a certain progr

Sometimes you need to get the size of the picture, which needs to be done after the picture is loaded. There are three ways to achieve it, as described below. First, the Load event Test, all browsers display "loaded", which means that all browsers support the IMG Load event. Ii. ReadyStateChange Incident ReadyState for complete and loaded indicates that the pictu

Sometimes you need to get the size of the picture, which needs to be done after the picture is loaded. There are three ways to achieve it, as described below. First, the Load event Test, all browsers display "loaded", which means that all browsers support the IMG Load event. Ii. ReadyStateChange Incident See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/webkf/script/

To detect if the jquery library is already loaded, you can use the following JavaScript code: if (typeof JQuery! = ' undefined ') { Alert ("JQuery library is loaded!"); }Else{ Alert ("JQuery Library is not found!"); } Another option. In some blogs and forums it is mentioned that you can use code to achieve the same purpose. If Alert ("JQuery library is l