事件
页面载入 ready(fn) //当DOM载入就绪可以查询及操纵时绑定一个要执行的函数。 $(document).ready(function(){}) -----------> $(function(){})
事件处理 $("").on(eve,[selector],[data],fn) // 在选择元素上绑定一个或多个事件的事件处理函数。
// .on的selector参数是筛选出调用.on方法的dom元素的指定子元素，如： // $('ul').on('click', 'li', function(){console.log('click');})就是筛选出ul下的li给其绑定 // click事件；
[selector]参数的好处: 好处在于.on方法为动态添加的元素也能绑上指定事件；如：
//$('ul li').on('click', function(){console.log('click');})的绑定方式和 //$('ul li').bind('click', function(){console.log('click');})一样；我通过js给ul添加了一个 //li：$('ul').append('<li>js new li<li>')；这个新加的li是不会被绑上click事件的
//但是用$('ul').on('click', 'li', function(){console.log('click');}方式绑定，然后动态添加 //li:$('ul').append('<li>js new li<li>');这个新生成的li被绑上了click事件 [data]参数的调用: function myHandler(event) { alert(event.data.foo); } $("li").on("click", {foo: "bar"}, myHandler)实例之面板拖动
<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title></title></head><body> <div style="border: 1px solid #ddd;width: 600px;position: absolute;"> <div id="title" style="height: 40px;color: white;"> 标题 </div> <div style="height: 300px;"> 内容 </div> </div><script type="text/javascript" src="jquery-2.2.3.js"></script><script> $(function(){ // 页面加载完成之后自动执行 $('#title').mouseover(function(){ $(this).css('cursor','move'); }).mousedown(function(e){ //console.log($(this).offset()); var _event = e || window.event; // 原始鼠标横纵坐标位置 var ord_x = _event.clientX; var ord_y = _event.clientY;
var parent_left = $(this).parent().offset().left; var parent_top = $(this).parent().offset().top;
$(this).bind('mousemove', function(e){ var _new_event = e || window.event; var new_x = _new_event.clientX; var new_y = _new_event.clientY;
var x = parent_left + (new_x - ord_x); var y = parent_top + (new_y - ord_y);
$(this).parent().css('left',x+'px'); $(this).parent().css('top',y+'px');
}) }).mouseup(function(){ $(this).unbind('mousemove'); }); })</script></body></html>实例之放大镜
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>bigger</title> <style> *{ margin: 0; padding:0; } .outer{ height: 350px; width: 350px; border: dashed 5px cornflowerblue; } .outer .small_box{ position: relative; } .outer .small_box .float{ height: 175px; width: 175px; background-color: darkgray; opacity: 0.4; fill-opacity: 0.4; position: absolute; display: none;
}
.outer .big_box{ height: 400px; width: 400px; overflow: hidden; position:absolute; left: 360px; top: 0px; z-index: 1; border: 5px solid rebeccapurple; display: none;
} .outer .big_box img{ position: absolute; z-index: 5; }
</style></head><body>
<div class="outer"> <div class="small_box"> <div class="float"></div> <img src="data:images/2.jpg">
</div> <div class="big_box"> <img src="2.jpg"> </div>
</div>
<script src="jquery-2.1.4.min.js"></script><script>
$(function(){
$(".small_box").mouseover(function(){
$(".float").css("display","block"); $(".big_box").css("display","block")
}); $(".small_box").mouseout(function(){
$(".float").css("display","none"); $(".big_box").css("display","none")
});
$(".small_box").mousemove(function(e){
var _event=e || window.event;
var float_width=$(".float").width(); var float_height=$(".float").height();
console.log(float_height,float_width);
var float_height_half=float_height/2; var float_width_half=float_width/2; console.log(float_height_half,float_width_half);
var small_box_width=$(".small_box").height(); var small_box_height=$(".small_box").width();
// 鼠标点距离左边界的长度与float应该与左边界的距离差半个float的width,height同理 var mouse_left=_event.clientX-float_width_half; var mouse_top=_event.clientY-float_height_half;
if(mouse_left<0){ mouse_left=0 }else if (mouse_left>small_box_width-float_width){ mouse_left=small_box_width-float_width }
if(mouse_top<0){ mouse_top=0 }else if (mouse_top>small_box_height-float_height){ mouse_top=small_box_height-float_height }
$(".float").css("left",mouse_left+"px"); $(".float").css("top",mouse_top+"px")
var percentX=($(".big_box img").width()-$(".big_box").width())/ (small_box_width-float_width); var percentY=($(".big_box img").height()-$(".big_box").height())/(small_box_height-float_height);
console.log(percentX,percentY)
$(".big_box img").css("left", -percentX*mouse_left+"px") $(".big_box img").css("top", -percentY*mouse_top+"px") }) })
</script></body></html>动画效果
回调函数
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script src="jquery-2.1.4.min.js"></script>
</head><body> <button>hide</button> <p>helloworld helloworld helloworld</p><script> $("button").click(function(){ $("p").hide(1000,function(){ alert($(this).html()) }) }) </script></body></html>扩展方法 (插件机制)
用JQuery写插件时，最核心的方两个方法
<script> $.extend(object) //为JQuery 添加一个静态方法。$.fn.extend(object) //为JQuery实例添加一个方法。
jQuery.extend({ min: function(a, b) { return a < b ? a : b; }, max: function(a, b) { return a > b ? a : b; } }); console.log($.min(3,4));
//-----------------------------------------------------------------------
$.fn.extend({ "print":function(){ for (var i=0;i<this.length;i++){ console.log($(this)[i].innerHTML) }
}});$("p").print();</script>实例之注册验证
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style> li{
list-style: disc;; } img{ display: block; height: 200px; } </style></head><body><form class="Form">
<p><input class="v1" type="text" name="username" mark="用户名"></p> <p><input class="v1" type="text" name="email" mark="邮箱"></p> <p><input class="v1" type="submit" value="submit" onclick="return validate()"></p>
</form>
<script src="jquery-2.1.4.min.js"></script><script> // 注意: // DOM对象--->jquery对象 $(DOM) // jquery对象--->DOM对象 $("")[0]
//---------------------------------------------------------
// DOM绑定版本 function validate(){
flag=true;
$("Form .v1").each(function(){ $(this).next("span").remove();// 防止对此点击按钮产生多个span标签 var value=$(this).val(); if (value.trim().length==0){ var mark=$(this).attr("mark"); var ele=document.createElement("span"); ele.innerHTML=mark+"不能为空!"; $(this).after(ele); $(ele).prop("class","error");// DOM对象转换为jquery对象 flag=false; // return false-------->引出$.each的return false注意点 }
}); return flag }</script></body></html>轮播图
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>轮播图</title> <style media="screen"> * { margin: 0; padding: 0; } #Number li{ width: 50px; height: 50px; background-color: #303a40; color: white; text-align: center; line-height: 50px; border-radius: 50%; margin-left: 30px; font-size: large; list-style-type: none; display: inline-block; } #Number{ position: absolute; width: 100%; text-align: center!important; top: 80%; }
.outer{ cursor: pointer; width: 60%; height: 75%; position: absolute; left: 50%; top: 10%; margin-left: -30%;
} .outer:hover .button{ display: inline-block; } .img img{ width: 100%; height: 100%; position: absolute; top: 0; bottom: 0; left: 0; right: 0; } .button{ display: none; opacity: 0.3; color: white; font-size: 50px; text-align: center; line-height: 80px; top: 50%; margin-top: -40px; position: absolute; width: 80px; height: 80px; background-color: black; } .r{ right: 0; } .l1{ background-color: red!important; } </style> </head> <body> <div class="outer" id="sliderWrap"> <div class="img" id="sliderContent">
</div> <div id="Number"> <ul>
</ul> </div> <div class="button l" id="left"> < </div> <div class="button r" id="right"> > </div> </div> </body><script src="jquery-2.1.4.min.js"></script> <script type="text/javascript"> var arr=['images/1.jpg','images/2.jpg','images/3.jpg','images/4.jpg','images/5.jpg','images/6.jpg'] $.each(arr,function (i,v) { console.log(i) $('.img').append("<a><img src="+v+"></a>") if(i==0){ $('ul').append("<li class='l1'>"+(i+1)+"</li>") }else{ $('ul').append("<li>"+(i+1)+"</li>") } }) $('.img').append("<a><img src="+arr[0]+"></a>") $('#Number li').mouseover(function () { $(this).addClass('l1').siblings().removeClass('l1') var index=$(this).index() i=index $('.img a').eq(index).stop().fadeIn(1000).siblings().stop().fadeOut(1000); }) var time = setInterval(move,2000) var i =0; function move() { if(i==arr.length-1){ i=-1 } i++ $('#Number li').eq(i).addClass('l1').siblings().removeClass('l1') $('.img a').eq(i).stop().fadeIn(1000).siblings().stop().fadeOut(1000); } $('.outer').hover(function () { clearInterval(time) },function () { time=setInterval(move,2000) }) $('.r').click(function () { move() }) $('.l').click(function () { if(i==0){ i=arr.length } i-- $('#Number li').eq(i).addClass('l1').siblings().removeClass('l1') $('.img a').eq(i).stop().fadeIn(1000).siblings().stop().fadeOut(1000); }) </script></html>
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