


This article mainly introduces jQuery's method of realizing the large-scale effect of mouse-over preview images, involving jQuery mouse event response and dynamic operation of page element attributes. Friends who need it can refer to it. I hope it can help everyone.
The example in this article describes how jQuery implements the effect of large-scale preview of pictures when the mouse slides over them. Share it with everyone for your reference, the details are as follows:
The requirements are as follows: When the mouse moves the picture, the preview of the large picture will be displayed at the same time, and when the mouse is moved away, it will be hidden.
The principle is actually very simple. First, you need a p, and then dynamically add the tag through the jQuery method, change the style (width, height) of the
, and the path of the image that needs to be displayed.
js code:
$(function(){ var ei = $("#large"); ei.hide(); $("#img1, img").mousemove(function(e){ ei.css({top:e.pageY,left:e.pageX}).html('<img src="/static/imghwm/default1.png" data-src="' + this.src + '" class="lazy" style="max-width:90%" / alt="jQuery realizes the effect of previewing the large image when the mouse slides over it" >').show(); }).mouseout( function(){ ei.hide(); }) $("#f1").change(function(){ $("#img1").attr("src","file:///"+$("#f1").val()); }) });
HTML part:
上传预览图片:<br> <input id="f1" name="f1" type="file" /><br> <img src="/static/imghwm/default1.png" data-src="logo-jq.gif" class="lazy" id="img1" style="max-width:90%" style="max-width:90%" alt="jQuery realizes the effect of previewing the large image when the mouse slides over it" > <p id="large"></p> 鼠标滑过预览图片:<br> <img src="/static/imghwm/default1.png" data-src="logo-jq.gif" class="lazy" style="max-width:90%" style="max-width:90%" alt="jQuery realizes the effect of previewing the large image when the mouse slides over it" ><br>
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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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