Home >Web Front-end >JS Tutorial >Detailed explanation of JS event binding and bubbling examples
A Apache 阿帕奇服务器 M Mysql P PHP P PERL
JSON 轻量级的数据交换格式 XML 一种数据交换格式 JSON用来表示对象和数组 var json = '["171204",{"name":"张飞","age":"20"},{"name":"关羽","age":"22"}]';// 通过JS自带的JSON.parse可以把JSON格式的字符串转化为对象var obj = JSON.parse(json);console.log(obj);
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>JSON</title> <style type="text/css"> .one{ text-align:center; overflow:hidden; width:700px; margin:0px auto; padding-left:20px; } .pA{ text-align:center; } .pB{ text-align:left; border:1px blue solid; } .two{ padding-left:10px; float:left; width:320px; margin-right:10px; margin-top:10px; margin-bottom:10px; padding-bottom:10px; } .three{ float:left; padding-bottom:5px; margin-left:5px; margin-top:10px; } .img1{ background-image:url(1.jpg); background-size:150px 100px; height:100px; border:1px red solid; } </style> </head> <body> </body> <script type="text/javascript"> var list = '{"address":"泗泾镇九干路168号","shopList":[{"name":"1众一品过桥米线", "cd":[{"title":"2黄焖鸡大份微辣","pir":"20","pl":["3土豆","鸡肉","姜","青椒"]},{"title": "4黄焖鸡大份中辣","pir":"20","pl":["5土豆","鸡肉","姜","尖椒"]},{"title":"6黄焖鸡大份重辣", "pir":"20","pl":["7土豆","鸡肉","姜","5个尖椒"]}]},{"name":"8老友记黄焖鸡","cd": [{"title":"9肥牛米线","pir":"20","pl":["10米线","青菜","肥牛","豆芽"]},{"title":"11鱼豆腐米线", "pir":"18","pl":["12米线","青菜","鱼豆腐","豆芽"]},{"title":"香菇米线","pir":"16","pl": ["13米线","青菜","香菇","豆芽"]}]},{"name":"14众一品黄焖鸭","cd":[{"title":"14肥牛米线", "pir":"20","pl":["15米线","青菜","肥牛","豆芽"]},{"title":"16鱼豆腐米线","pir":"18", "pl":["17米线","青菜","鱼豆腐","豆芽"]},{"title":"18香菇米线","pir":"16","pl":["19米线","青菜", "香菇","豆芽"]}]},{"name":"众一品黄焖猪","cd":[{"title":"20肥牛米线","pir":"20","pl": ["米线","青菜","肥牛","豆芽"]},{"title":"21鱼豆腐米线","pir":"18","pl":["米线", "青菜","鱼豆腐","豆芽"]},{"title":"22香菇米线","pir":"16","pl":["米线","青菜","香菇","豆芽"]}]}, {"name":"23众一品黄焖狗","cd":[{"title":"24肥牛米线","pir":"20","pl":["米线","青菜","肥牛","豆芽"]}, {"title":"25鱼豆腐米线","pir":"18","pl":["米线","青菜","鱼豆腐","豆芽"]},{"title":"26香菇米线","pir":"16", "pl":["米线","青菜","香菇","豆芽"]}]}]}'; var listObj = JSON.parse(list); var body = document.getElementsByTagName('body')[0]; var p1 = document.createElement("p"); var pA = document.createElement("p"); var pB = document.createElement("p"); p1.className="one"; pA.className="pA"; p1.style.border="1px blue solid"; pA.innerHTML = "地址:" + listObj.address; pB.innerHTML = "商家:"; pB.className = "pB"; body.appendChild(p1); p1.appendChild(pA); p1.appendChild(pB); for(var i=0; i<listObj.shopList.length;i++){ var shop = listObj.shopList[i]; var p2 = document.createElement("p"); p2.className="two"; var h4 = document.createElement("h4"); p2.style.border="1px red solid"; p1.appendChild(p2); p2.appendChild(h4); h4.innerHTML = shop.name; for(var j=0; j<shop.cd.length;j++){ var p3 = document.createElement("p"); p2.appendChild(p3); p3.style.width="150px"; p3.className="three"; p3.style.border="1px black solid"; var cd = shop.cd[j]; p3.innerHTML = cd.title; var img = document.createElement("p"); img.className="img1"; p3.appendChild(img); var p4 = document.createElement("p"); p4.innerHTML = cd.pir; p3.appendChild(p4); var p8 = document.createElement("p"); p8.innerHTML = "配料:"; for(var k=0; k<cd.pl.length;k++){ p8.innerHTML = p8.innerHTML + cd.pl[k]; } p3.appendChild(p8); } } </script> </html>
<!DOCTYPE html><html lang="en"> <head> <meta charsert="UTF-8" /> <title>JSON</title> </head> <body> </body> <script type="text/javascript"> // 1.创建请求对象 var request = new XMLHttpRequest(); // 2.设置请求并发送 true代表异步 false代表同步 request.open("GET","text.jason",true); request.send(); request.onreadystatechange = function(){ if(request.readyState==4 && request.status==200){ // 请求成功 console.log(request.responseText); } } </script></html>
{"address":"泗泾镇九干路168号","shopList":[{"name":"1众一品过桥米线", "cd":[{"title":"2黄焖鸡大份微辣","pir":"20","pl":["3土豆","鸡肉","姜","青椒"]},{"title": "4黄焖鸡大份中辣","pir":"20","pl":["5土豆","鸡肉","姜","尖椒"]},{"title":"6黄焖鸡大份重辣", "pir":"20","pl":["7土豆","鸡肉","姜","5个尖椒"]}]},{"name":"8老友记黄焖鸡","cd": [{"title":"9肥牛米线","pir":"20","pl":["10米线","青菜","肥牛","豆芽"]},{"title":"11鱼豆腐米线", "pir":"18","pl":["12米线","青菜","鱼豆腐","豆芽"]},{"title":"香菇米线","pir":"16","pl": ["13米线","青菜","香菇","豆芽"]}]},{"name":"14众一品黄焖鸭","cd":[{"title":"14肥牛米线", "pir":"20","pl":["15米线","青菜","肥牛","豆芽"]},{"title":"16鱼豆腐米线","pir":"18", "pl":["17米线","青菜","鱼豆腐","豆芽"]},{"title":"18香菇米线","pir":"16","pl":["19米线","青菜", "香菇","豆芽"]}]},{"name":"众一品黄焖猪","cd":[{"title":"20肥牛米线","pir":"20","pl": ["米线","青菜","肥牛","豆芽"]},{"title":"21鱼豆腐米线","pir":"18","pl":["米线", "青菜","鱼豆腐","豆芽"]},{"title":"22香菇米线","pir":"16","pl":["米线","青菜","香菇","豆芽"]}]}, {"name":"23众一品黄焖狗","cd":[{"title":"24肥牛米线","pir":"20","pl":["米线","青菜","肥牛","豆芽"]}, {"title":"25鱼豆腐米线","pir":"18","pl":["米线","青菜","鱼豆腐","豆芽"]},{"title":"26香菇米线","pir":"16", "pl":["米线","青菜","香菇","豆芽"]}]}]}
<!DOCTYPE html><html lang="en"> <head> <meta charset="utf-8" /> <title>事件绑定</title> <style> .redp{ width:200px; height:200px; background-color:red; } </style> </head> <body> <p class="redp"></p> </body> <script> var redp = document.getElementsByClassName('redp')[0]; // 事件绑定 - 可以给一个元素绑定多个相同的事件 redp.addEventListener("click", function(){ console.log(1); },false); redp.addEventListener("click",f2,false); function f2(){ console.log(2); } redp.removeEventListener("click",f2,false); </script></html>
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> .box{ width:600px; height:600px; background-color:red; margin:100px auto; overflow:hidden; } .mid{ width:400px; height:400px; background-color:gold; margin:100px auto; overflow:hidden; } .item{ height:200px; width:200px; background-color:blue; margin:100px auto; } </style> </head> <body> <p class="box"> <p class="mid"> <p class="item"> </p> </p> </p> </body> <script> var box = document.getElementsByClassName('box')[0]; var mid = document.getElementsByClassName('mid')[0]; var item = document.getElementsByClassName('item')[0]; box.addEventListener("click",function(){ console.log("box"); },false); mid.addEventListener("click",function(ev){ // 取消冒泡 - 阻止事件冒泡 ev.cancelBubble = true; // 第一种方法 ev.stopPropagation(); // 第二种方法 console.log("mid"); // 兼容写法 主要一些IE浏览器不支持 if(ev.stopPropagation){ ev.stopPropagation(); }else{ ev.cancelBubble = true; } // 阻止默认事件 ev.preventDefault(); // 第一种写法 ev.returnValue = false; // 第二种写法 return false; // 第三种写法 },false); item.addEventListener("click",function(){ console.log("item"); },false);
console.log(ev.target);if(ev.target != this){ console.log();}
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