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HomeWeb Front-endJS TutorialjQuery User Manual (5)_jquery

:动态效果

       在将这部分之前我们先看个例子,相信做网页的朋友都遇到n级菜单的情景,但点击某菜单按钮时,如果它的子菜单是显示的,则隐藏子菜单,如果子菜单隐藏,则显示出来,传统的javascript做法是先用getElementById取出子菜单所在容器的id,在判断该容器的style.display是否等于none,如果等于则设为block,如果不等于这设为none,如果在将效果设置复杂一点,当点击按钮时,不是忽然隐藏和显示子菜单,而是高度平滑的转变,这时就要通过setTimeout来设置子菜单的height了,再复杂一点透明度也平滑的消失和显现,这时显现下来需要编写很多代码,如果js 基础不好的朋友可能只能从别人写好的代码拿过来修改了!jQuery实现上面效果只需要1句话就行,$("#a").toggle("slow"),,学完jQuery后还需要抄袭修改别人的代码吗?下面我们逐个介绍jQuery用于效果处理的方法。

hide()  隐藏匹配对象

id="a">Hello Againp>href="#" onClick=' ("#a").hide()'>jQuerya>
当点击连接时,id为a的对象的display变为none。

show() 显示匹配对象

hide(speed)  以一定的速度隐藏匹配对象,其大小(长宽)和透明度都逐渐变化到0,speed有3级("slow", "normal",  "fast"),也可以是自定义的速度。

show(speed)  以一定的速度显示匹配对象,其大小(长宽)和透明度都由0逐渐变化到正常

hide(speed, callback)  show(speed, callback) 当显示和隐藏变化结束后执行函数callback

toggle()    toggle(speed) 如果当前匹配对象隐藏,则显示他们,如果当前是显示的,就隐藏,toggle(speed),其大小(长宽)和透明度都随之逐渐变化。

img src="1.jpg" style="width:150px"/>
href="#" onClick='$("img").toggle("slow")'>jQuerya>


fadeIn(speeds)   fadeOut(speeds)  根据速度调整透明度来显示或隐藏匹配对象,注意有别于hide(speed)和show(speed),fadeIn和fadeOut都只调整透明度,不调整大小

img src="1.jpg" style="display:none"/>href="#" onClick='$("img ").fadeIn("slow")'> jQuery a>

点击连接后可以看到图片逐渐显示。

fadeIn(speed, callback)  fadeOut(speed, callback)   callback为函数,先通过调整透明度来显示或隐藏匹配对象,当调整结束后执行callback函数

img src="1.jpg"/>
href="#" onClick='$("img ").fadeIn("slow",function(){ alert("Animation Done."); })'> jQuery a>

点击连接后可以看到图片逐渐显示,显示完全后弹出对话框

fadeTo(speed, opacity, callback)  将匹配对象以speed速度调整倒透明度opacity,然后执行函数callback。Opacity为最终显示的透明度(0-1).

img src="1.jpg"/>br>
href="#" onClick='$("img ").fadeTo("slow",0.55,function(){ alert("Animation Done."); })'> jQuery a>

You can take a look and see the effect for yourself. If you don’t use jQuery, writing original javascript scripts may be a lot of code!

slideDown(speeds) Smoothly change the height of the matching object from 0 to normal at the specified rate!

img src="1.jpg" style ="display:none"/>
a href="#" onClick='$("img ").slideDown("slow")' >jQuerya>


slideDown(speeds,callback) Change the height of the matching object from 0 to normal! After the change is completed, execute the function callback

slideUp("slow") slideUp(speed, callback) The height of the matching object changes from normal to 0

slideToggle("slow") If the height of the matching object is normal, it will gradually change to 0. If it is 0, it will gradually change to normal

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