


The example in this article describes jquery's implementation of clicking to view more content to control the expansion and folding effect of paragraph text. Share it with everyone for your reference. The details are as follows:
Here we use jQuery to implement the text expansion and folding effect. After clicking on the text, the text content will be displayed completely. Control the paragraph to display the text. When not needed, you can click again to collapse the content. That is to say, part of the content is hidden. Click to see more functions are used in many large websites. For example, some movie introductions and product introductions are sometimes hidden by default for the layout effect of the page. Users can click to expand when they want to see it.
The operation effect is shown in the figure below:
The specific code is as follows:
<!DOCTYPE html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jQuery文本段落展开和折叠效果</title> <style> html,body,p,h2,p{margin: 0;padding: 0;} html{font: 1em Arial, Helvetica, sans-serif;color: #444;} a{color: #0087f1;} p{margin-bottom: 5px;} #container{margin: 0 auto;width: 600px;} #container h2{font-size: 20px;color: #0087f1;} #wrap{position: relative;padding: 10px;overflow: hidden;} #gradient{width: 100%;height: 35px;background: url() repeat-x;position: absolute;bottom: 0;left: 0;} #read-more{padding: 5px;border-top: 4px double #ddd;background: #fff;color: #333;} #read-more a{padding-right: 22px;background: url() no-repeat 100% 50%;font-weight: bold;text-decoration: none;} #read-more a: hover{color: #000;} </style> <script type="text/javascript" src="jquery-1.6.2.min.js?7.1.34"></script> <script type="text/javascript"> $(function(){ var slideHeight = 75; // px var defHeight = $('#wrap').height(); if(defHeight >= slideHeight){ $('#wrap').css('height' , slideHeight + 'px'); $('#read-more').append('<a href="#">点击查看更多。。</a>'); $('#read-more a').click(function(){ var curHeight = $('#wrap').height(); if(curHeight == slideHeight){ $('#wrap').animate({ height: defHeight }, "normal"); $('#read-more a').html('点击隐藏'); $('#gradient').fadeOut(); }else{ $('#wrap').animate({ height: slideHeight }, "normal"); $('#read-more a').html('点击查看更多。。'); $('#gradient').fadeIn(); } return false; }); } }); </script> </head> <body> <p id="container"> <h1 id="jQuery-nbsp-控制段落文字展开折叠-点击查看更多的功能">jQuery 控制段落文字展开折叠,点击查看更多的功能</h1> <h2 id="About-nbsp-Billabong">About Billabong</h2> <p id="wrap"> <p> <p>Gordon developed his own stitching technique, which made the garments more durable, cost effective and less labor intensive. He employed machinists, moved the operation into a factory, set up a distribution network and sponsored a team of renowned Australian surfers. The business thrived.</p> <p>Since those beginnings, Billabong has expanded its product range to include boardsport products such as wetsuits, watches, surfboards, snowboard outerwear and skateboarding apparel.</p> </p> <p id="gradient"></p> </p> <p id="read-more"></p> </p> </body> </html>

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。

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。

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。

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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