Web Front-endHTML TutorialThe problem of callback function in jquery, prawn can help solve it~_html/css_WEB-ITnose
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8" /><script src="jquery-1.9.1.min.js" type="text/javascript"></script><script type="text/javascript" >$(function(){ var t = []; var dt = $("dl.collapse dt"); var dd = $("dl.collapse dd"); dt.each(function(i){ t[i] = false; $(dt[i]).click((function(i,dd){ return function(){ if( t[i]){ $(dd).show(); t[i] = false; } else{ $(dd).hide(); t[i] = true; } } })(i,dd[i])); })})</script><style type="text/css">.collapse { border:solid 1px #ccc; margin:2px; float:left; }.collapse dt { padding:8px 8px; background:#7FECAD url(green.gif) repeat-x; font-size:13px; font-weight:bold; color:#71790C; border-bottom:solid 1px #efefef; cursor:pointer; }.collapse dd { margin:0; padding:6px; }.w1 {width:310px;}.w2 {width:221px;}.w3 {width:665px;}</style><title>上机练习</title></head><body><dl class="collapse w1"> <dt>音乐标签</dt> <dd><img src="/static/imghwm/default1.png" data-src="mp31.jpg" class="lazy" / alt="The problem of callback function in jquery, prawn can help solve it~_html/css_WEB-ITnose" ></dd></dl><dl class="collapse w2"> <dt>新歌TOP100</dt> <dd><img src="/static/imghwm/default1.png" data-src="mp32.jpg" class="lazy" / alt="The problem of callback function in jquery, prawn can help solve it~_html/css_WEB-ITnose" ></dd></dl><dl class="collapse w3"> <dt>音乐掌门人</dt> <dd><img src="/static/imghwm/default1.png" data-src="mp33.jpg" class="lazy" / alt="The problem of callback function in jquery, prawn can help solve it~_html/css_WEB-ITnose" ></dd></dl></body></html> green.gif:
mp31.jpg:
mp32.jpg:
mp33.jpg:
I want to ask about this code :
$(dt[i]).click((function(i,dd){ return function(){ if( t[i]){ $(dd).show(); t[i] = false; } else{ $(dd).hide(); t[i] = true; } } })(i,dd[i])); What is the function of return?
Why not change it to the following?
$(dt[i]).click((function(i,dd){ if( t[i]){ $(dd).show(); t[i] = false; } else{ $(dd).hide(); t[i] = true; } })(i,dd[i]));
Reply to the discussion ( Solution)
Click binding must be a function. After you modify it, it will become a function that is automatically executed when it comes up. This is definitely wrong
And because of the problem of i scope, use Closure solves the i index problem, and finally returns the function to click
One is to pass the function, the one you wrote is executed directly, the difference is so big
After two people’s guidance, I already understand~thank you
jquery实现多少秒后隐藏图片Apr 20, 2022 pm 05:33 PM实现方法：1、用“$("img").delay(毫秒数).fadeOut()”语句，delay()设置延迟秒数；2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句，通过定时器来延迟。
jquery怎么修改min-height样式Apr 20, 2022 pm 12:19 PM修改方法：1、用css()设置新样式，语法“$(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“$(元素).attr("style","min-height:新值")”。
axios与jquery的区别是什么Apr 20, 2022 pm 06:18 PM区别：1、axios是一个异步请求框架，用于封装底层的XMLHttpRequest，而jquery是一个JavaScript库，只是顺便封装了dom操作；2、axios是基于承诺对象的，可以用承诺对象中的方法，而jquery不基于承诺对象。
jquery怎么在body中增加元素Apr 22, 2022 am 11:13 AM增加元素的方法：1、用append()，语法“$("body").append(新元素)”，可向body内部的末尾处增加元素；2、用prepend()，语法“$("body").prepend(新元素)”，可向body内部的开始处增加元素。
jquery中apply()方法怎么用Apr 24, 2022 pm 05:35 PM在jquery中，apply()方法用于改变this指向，使用另一个对象替换当前对象，是应用某一对象的一个方法，语法为“apply(thisobj,[argarray])”；参数argarray表示的是以数组的形式进行传递。
jquery怎么删除div内所有子元素Apr 21, 2022 pm 07:08 PM删除方法：1、用empty()，语法“$("div").empty();”，可删除所有子节点和内容；2、用children()和remove()，语法“$("div").children().remove();”，只删除子元素，不删除内容。
jquery on()有几个参数Apr 21, 2022 am 11:29 AMon()方法有4个参数：1、第一个参数不可省略，规定要从被选元素添加的一个或多个事件或命名空间；2、第二个参数可省略，规定元素的事件处理程序；3、第三个参数可省略，规定传递到函数的额外数据；4、第四个参数可省略，规定当事件发生时运行的函数。
jquery怎么去掉只读属性Apr 20, 2022 pm 07:55 PM去掉方法：1、用“$(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。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SublimeText3 Chinese version
Chinese version, very easy to use
Dreamweaver Mac version
Visual web development tools
WebStorm Mac version
Useful JavaScript development tools
Notepad++7.3.1
Easy-to-use and free code editor
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
