Benefits of jquery ajax: 1. No plug-in support is required; 2. Good user experience, it can partially update page information without refreshing the entire page, and quickly return user operation results; 3. Improve Web programs Performance; 4. Reduce the burden on servers and bandwidth.
The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.
The emergence of Ajax has opened the era of updating pages without refreshing, and partially refreshing the page without refreshing the page. It has the tendency to replace the traditional Web method and perform asynchronous submission through hidden frameworks, which is a milestone in Web development and application.
Benefits (advantages) of using jquery ajax:
1. No plug-in support is required
Now it can be supported by most mainstream browsers. Of course, users only need to allow JavaScript to execute on the browser.
2. Good user experience
It can partially update page information without refreshing the entire page, and quickly return user operation results. This is also the biggest advantage of ajax.
3. Improve the performance of Web programs
The transmission method of Ajax gives it a great advantage in performance. In the traditional mode, data submission is implemented through the Form form. The page needs to refresh the entire page to obtain the entire page content, while the Ajax mode only submits the required data to the server through the XMLHttpRequest object and refreshes the part.
4. Reduce the burden on the server and bandwidth
The working principle of Ajax is equivalent to adding an intermediate layer between the user and the server, so that user operations and server responses Asynchronous, it uses the Ajax engine on the client to transfer some of the work burdened by the server in the traditional way to the client, making it easier for the client to process resources and reducing the burden on the server and bandwidth.
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实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。


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