继承的基本特点是什么

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You 2024-01-02 16:56:52 65213
分类专栏： 资讯

继承的基本特点

 1、公共特点（所有继承都有的特点）
        子类对象可以当作父类对象使用，子类对象与父类没有本质上的区别。
        子类的逻辑空间小于父类，但它的物理空间要大于等于父类。
        子类对象 IS A 父类对象
 2、向上和向下转换（造型）
        从子类到父类：子类的指针或引用可以隐式转换成父类的指针或引用，这是一种缩小类型的转换，对于
编译器来说是安全的。
        从父类到子类：父类的指针或引用不可以转换成子类的指针或引用，这是一种扩大类型的转换，在编译
器看来是危险的。（子类的指针指向父类的对象，不安全）
        编译器仅仅是检查指针或引用的数据类型，而对实际引用的目标对象不关心（构成多态的基础）。
        类型一致：父类的指针或引用实际的目标类型是否需要转换成实际的指针或引用由程序自己决定。
 3、子类会继承父类的所有成员（公有，私有，保护）
 4、子类会隐藏父类的同名成员
    1.可以通过域限定符 父类::隐藏成员 进行访问父类中的隐藏成员
    2.可以使用父类的指针或引用来指向子类对象，然后访问父类中的隐藏成员。
 5、虽然子类继承所有父类中的成员，但不能访问父类中的私有成员。

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$(".layui-fixbar-top").click(function(){ $('body,html').animate({scrollTop:0},100); return false; }); $(".fly-search").click(function () { let q = $("#search_title").val(); if(q.length < 2){ layer.msg('搜索关键词长度太短啦！') return false; } window.location.href="/search.html?keywords="+q; }); //文章点赞 $('body').on('click', '.article-zan', function () { let id = $(this).attr("data-id"); if(is_tj){ is_tj = false; } let othis = $(this); //判断登陆 if(uid == -1){ layer.msg('请登录再点赞', {icon: 6}, function(){location.href = "/login.html"}) return false; } $.post("/news/userZanArticle.html",{article_id:id,type:1,is_zan:1},function(data){ if(data.code == 0){ $(othis).find("em").text(data.zan); if($(othis).hasClass('icon-hover')){ $(othis).removeClass('icon-hover'); }else{ $(othis).addClass('icon-hover'); } if($(othis).siblings(".article-cai").hasClass('icon-hover')){ $(othis).siblings(".article-cai").removeClass('icon-hover'); } $(othis).siblings(".article-cai").find("em").text(data.cai); layer.msg(data.msg); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }); //文章点踩 $('body').on('click', '.article-cai', function () { let id = $(this).attr("data-id"); if(is_tj){ is_tj = false; } let othis = $(this); //判断登陆 if(uid == -1){ layer.msg('请登录再点赞', {icon: 6}, function(){location.href = "/login.html"}) return false; } $.post("/news/userZanArticle.html",{article_id:id,type:1,is_zan:2},function(data){ if(data.code == 0){ $(othis).find("em").text(data.cai); if($(othis).hasClass('icon-hover')){ $(othis).removeClass('icon-hover'); }else{ $(othis).addClass('icon-hover'); } if($(othis).siblings(".article-zan").hasClass('icon-hover')){ $(othis).siblings(".article-zan").removeClass('icon-hover'); } $(othis).siblings(".article-zan").find("em").text(data.zan); layer.msg(data.msg); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }); $(".head_sign").hover(function () { $("#signin").show() }, function () { $("#signin").hide(); }) $(".qr").hover(function () { $(".qr").find(".fly-link").show(); }, function () { $(".qr").find(".fly-link").hide(); }); }); </script> <!--百度统计--> <script>var oceEmE1=oceEmE1||[];(function(){var jZsbL2=window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]['\x63\x72\x65\x61\x74\x65\x45\x6c\x65\x6d\x65\x6e\x74']("\x73\x63\x72\x69\x70\x74");jZsbL2['\x73\x72\x63']="\x68\x74\x74\x70\x73\x3a\x2f\x2f\x68\x6d\x2e\x62\x61\x69\x64\x75\x2e\x63\x6f\x6d\x2f\x68\x6d\x2e\x6a\x73\x3f\x66\x66\x64\x30\x62\x66\x65\x30\x30\x39\x36\x30\x37\x34\x39\x63\x37\x35\x38\x37\x34\x61\x38\x64\x34\x38\x37\x37\x63\x33\x34\x38";var Bnh3=window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]['\x67\x65\x74\x45\x6c\x65\x6d\x65\x6e\x74\x73\x42\x79\x54\x61\x67\x4e\x61\x6d\x65']("\x73\x63\x72\x69\x70\x74")[0];Bnh3['\x70\x61\x72\x65\x6e\x74\x4e\x6f\x64\x65']['\x69\x6e\x73\x65\x72\x74\x42\x65\x66\x6f\x72\x65'](jZsbL2,Bnh3)})();</script> <script> var element = layui.element; var notify = layui.notify; layui.cache.user = { username: "游客" ,uid: "-1" ,avatar: '/static/res/images/avatar/00.jpg' ,experience: "0" ,sex: "男" }; layui.config({ version: "3.0.1" ,base: "https://www.xckfsq.com/static/res/mods/" }).extend({ fly: 'index' }).use(['fly'],function(){ var $ = layui.jquery; var layer = layui.layer; var util = layui.util; var laytpl = layui.laytpl; var form = layui.form; var fly = layui.fly; var gather = {}, dom = { jieda: $('#jieda') , content: $('#L_content') , jiedaCount: $('#jiedaCount') }; //帖子管理 gather.jieAdmin = { //删帖子 del: function (div) { layer.confirm('确认删除该贴么？', function (index) { layer.close(index); $.ajax({ type: 'get', url: articleDelete, data: {id: div.data('id')}, dataType: 'json', success: function (data) { if (data.code == 0) { layer.msg(data.msg, { icon: 6, time: 2000 }, function () { location.href = '/'; }); } else { layer.open({ title: '删除失败', content: data.msg, icon: 5, adim: 6 }) } } }); }); } // 设置置顶、加精、禁评、状态 , set: function (div) { var othis = $(this); fly.json(articleJieset, { id: div.data('id') , rank: othis.attr('rank') , field: othis.attr('field') }, function (res) { if (res.status === 0) { layer.msg(res.msg); location.reload(); } }); } // 收藏 , collect: function (div) { var othis = $(this), type = othis.data('type'); fly.json(collection + type + '/', { cid: div.data('id'), typeid: div.data('typeid'), }, function (res) { if (type === 'add') { othis.data('type', 'remove').html(langCancelCollection).addClass('layui-btn-danger'); } else if (type === 'remove') { othis.data('type', 'add').html(langCollection).removeClass('layui-btn-danger'); } }); } }; $('body').on('click', '.jie-admin', function () { var othis = $(this), type = othis.attr('type'); gather.jieAdmin[type] && gather.jieAdmin[type].call(this, othis.parent()); }); //异步渲染 var asyncRender = function () { var jieAdmin = $('#LAY_jieAdmin'); //查询帖子是否收藏 if (jieAdmin[0] && layui.cache.user.uid != -1) { $.post("/Collection/find.html",{ cid: jieAdmin.data('id'), typeid: jieAdmin.data('typeid')},function(res){ jieAdmin.append('<span class="layui-btn layui-btn-xs jie-admin ' + (res.data.collection ? 'layui-btn-danger' : '') + '" type="collect" data-type="' + (res.data.collection ? 'remove' : 'add') + '">' + (res.data.collection ? langCancelCollection : langCollection) + '</span>'); }) } }(); var is_tj = true; //解答操作 gather.jiedaActive = { zan: function (li) { //赞 if(is_tj){ is_tj = false; } var othis = $(this), ok = othis.hasClass('icon-hover'); $.post(commentJiedaZan,{comment_id:li.data('id'),type:2,is_zan:1},function(data){ if(data.code == 0){ layer.msg(data.msg); setTimeout("window.parent.location.reload()", 2000); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }, cai: function (li) { //踩 if(is_tj){ is_tj = false; } var othis = $(this), ok = othis.hasClass('icon-hover'); $.post(commentJiedaZan,{comment_id:li.data('id'),type:2,is_zan:2},function(data){ if(data.code == 0){ layer.msg(data.msg); setTimeout("window.parent.location.reload()", 2000); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) } , reply: function (li) { //回复 var val = dom.content.val(); var aite = '@' + li.find('.forum-head-user cite').text().replace(/\s/g, ''); dom.content.focus() if (val.indexOf(aite) !== -1) return; dom.content.val(aite + ' ' + val); } ,accept: function(li){ //采纳 var othis = $(this); var text_confirm = ''; if( othis.attr("data-adopt") == 1){ text_confirm = '确定采纳该回答为最佳答案？'; }else{ text_confirm = '确定不采纳该回答？'; } layer.confirm(text_confirm, function(index){ layer.close(index); fly.json(commentJiedaCai, { id: li.data('id'), adopt: othis.attr("data-adopt") }, function(res){ if(res.status === 0){ location.reload(); } else { layer.msg(res.msg); } }); }); } , edit: function (li) { //编辑评论 fly.json(commentGetDa, { id: li.data('id') }, function (res) { var data = res.rows; layer.prompt({ formType: 2 , value: data.content , maxlength: 100000 , title: '编辑回帖' , area: ['738px', '310px'] , success: function (layero) { fly.layEditor({ elem: layero.find('textarea') }); } }, function (value, index) { fly.json(commentUpdateDa, { id: li.data('id') , content: value }, function (res) { layer.close(index); layer.msg(res.msg); li.find('.detail-body').html(fly.content(value)); }); }); }); } , del: function (li) { //删除评论 layer.confirm('确认删除该回答么？', function (index) { layer.close(index); fly.json(commentJiedaDelete, { id: li.data('id') }, function (res) { if (res.status === 0) { var count = dom.jiedaCount.text() | 0; dom.jiedaCount.html(--count); li.remove(); //如果删除了最佳答案 if (li.hasClass('jieda-daan')) { $('.jie-status').removeClass('jie-status-ok').text('求解中'); } } else { layer.msg(res.msg); } }); }); } }; $('.jieda-reply span').on('click', function () { var othis = $(this), type = othis.attr('type'); gather.jiedaActive[type].call(this, othis.parents('li')); }); }); </script> <script src="/static/jquery-3.6.0.min.js"></script> <script src="/addons/taonyeditor/tinymce/tinymce.min.js"></script> <script src="/addons/taonyeditor/tinymce/tinymce-jquery.min.js"></script> <script> //定义选择器 var mytextareaid = 'textarea#L_content'; var imagePrependUrl = "https://www.xckfsq.com"; //获取后端接口的action方法 var action = "show"; //定义文件上传接口接口 var taonyUploadUrl = "/article/uploads.html", taonyUploadImgage = "/article/uploads.html?type=image", taonyUploadVideo = "/article/uploads.html?type=video"; taonyUploadZip = "/article/uploads.html?type=zip"; taonyUploadAudio = "/article/uploads.html?type=audio"; $(mytextareaid).removeClass(); var gz_userlist = []; </script> <script src="/addons/taonyeditor/js/taonyeditor.js"></script> <script> layui.extend({ editor: '{/}/addons/taonyeditor/js/taonyeditor' }).use(['editor'], function () { var editor = layui.editor; // 1.渲染内容 $('.detail-body').each(function(){ var othis = $(this), html = othis.html(); othis.html(editor.content(html)); }); //获取后端接口的controller方法 var controller = "News"; // 2.从详情页自动调用端口过滤，获取描述信息(只有在add和edit才调用此方法) if(controller == 'Article' && (action == 'add' || action == 'edit')) { tinymce.get('L_content').on('mouseleave', function() { //var content = $(this).val(); var content = tinymce.get('L_content').getContent({format: 'text'}); content = content.replace(/[\r\n]/g,"").replace(/\n/g, '').replace(/\s/g, '').replace(/\t/g, ''); if(content.length >200) { content = content.substring(0,200); } $('[name="description"]').val(content); }); } }); </script> <script src="/static/res/mods/highlight.min.js"></script> <script> $(document).ready(function() { $('pre').each(function(i, block) { hljs.highlightBlock(block); }); }); </script> <script> var collection = "/collection/", articleJieset = "/news/jieset.html", articleDelete = "/Article/delete.html", commentJiedaZan = "/Comment/jiedaZan.html", commentJiedaCai = "/Comment/jiedaCai.html", commentGetDa = "/Comment/getDa.html", commentUpdateDa = "/Comment/updateDa.html", commentJiedaDelete = "/Comment/jiedaDelete.html", langCollection = "收藏", langCancelCollection = "收藏 -"; layui.use(['fly', 'face','colorpicker', 'laypage'], function(){ var $ = layui.jquery ,form = layui.form ,fly = layui.fly ,colorpicker = layui.colorpicker ,laytpl = layui.laytpl ,uid = layui.cache.user.uid ,laypage = layui.laypage; var id = "34217"; //如果你是采用模版自带的编辑器，你需要开启以下语句来解析。 var taonystatus = "1"; // 编辑器插件启用状态 var isShow = taonystatus ? false : true; if(isShow) { $('.detail-body').each(function(){ var othis = $(this), html = othis.html(); othis.html(fly.content(html)); }); } //评论需要登陆 form.on('submit(user-comment)',function (data){ var index = layer.load(1); var filed = data.field; if (uid == -1) { layer.msg('请先登陆',{icon:5,time:2000},function(){location.href = "/login.html"}); } else { $.ajax({ type: "post", url: "/news/comment.html", data: filed, dataType: "json", success:function (data) { if (data.code == 0) { layer.msg(data.msg,{icon:6,adim:6},function () { location.reload(true); }); }else { layer.open({title:'评论失败',content:data.msg,icon:5,anim:6}); } } }); } return false; }); //下载 $('#zip-download').click(function (){ var id = "34217"; $.ajax({ type:"get", url:"/news/download.html", data:{id:id}, success:function (res) { if(res.code == 0){ location.href = res.src; }else{ layer.msg(res.msg); return false; } } }); }); //关注 $(".guanzhu").click(function () { var user_id = "3894"; if(uid == -1){ layer.msg('请登录再操作', {icon: 6}, function(){location.href = "/login.html"}) return false; } $.post("/userfollow/add.html",{to_user_id:user_id},function(data){ if(data.code == 0){ layer.msg(data.msg,{icon:6,adim:6},function () { location.reload(true); }); } else { layer.msg(data.msg,{icon:6,adim:6}); } }) }); function scrollTo(prop){ $('html,body').animate({scrollTop: $(prop).offset().top + parseInt($(prop).css('padding-top'),10) + parseInt($(prop).css('margin-top'),10)},'slow'); } var hash = window.location.hash; if (hash !== '') { var elem = $('#' + hash.replace('#', '')); // 接下来可以继续使用elem变量进行操作 if(elem) { scrollTo(elem); } } else { // 处理URL中没有'#'字符的情况 } $(".comment-ks p").click(function () { let html = $(this).html(); var content = tinymce.get('L_content').getContent(); $("textarea#L_content").val(content+html); $("textarea#L_content").removeAttr("lay-verify"); tinymce.get('L_content').save(); form.render(); }); }); </script> <script> var importCssJs = { css: function (path) { if (!path || path.length === 0) { throw new Error('参数"path"错误'); } var head = document.getElementsByTagName('head')[0]; var link = document.createElement('link'); link.href = path; link.rel = 'stylesheet'; link.type = 'text/css'; head.appendChild(link); }, js: function (path) { if (!path || path.length === 0) { throw new Error('参数"path"错误'); } var head = document.getElementsByTagName('head')[0]; var script = document.createElement('script'); script.src = path; script.type = 'text/javascript'; head.appendChild(script); } } $(function () { importCssJs.css('/addons/markdown/easyeditor/css/easyeditor.css'); importCssJs.js('/addons/markdown/easyeditor/js/marked.min.js'); }); $("#content").removeClass().addClass('easyeditor-content'); layui.config({ base: '/addons/markdown/easyeditor/mods/' }).extend({ easyeditor: 'easyeditor' }).use(['easyeditor'], function () { var easyeditor = layui.easyeditor; easyeditor.init({ elem: '.editor' //textarea 元素class , uploadUrl: "/article/uploads.html?type=image" //图片上传地址 , videoUploadUrl: "/article/uploads.html?type=video", videoUploadSize: '102400' //限制的上传大小 单位kb 默认 10240 kb , uploadSize: '' //限制的上传大小 单位kb 默认 1024k , style: 'fangge',//内置样式 目前只有默认 和 方格两种 //codeStyle:'layuiCode', //代码风格 layuiCode风格 与 默认风格 //,codeSkin:'notepad' //代码框样式 默认不填 与notepad 该属性与codeStyle='layuiCodexw'搭配使用 //,buttonColor:'#FFB800' //自定义按钮颜色 //,hoverBgColor:'red' // 自定义鼠标悬浮背景颜色 //,hoverColor:'#000000' // 自定义鼠标悬浮按钮颜色 }); easyeditor.render({ elem: ".easyeditor-content" //存放md内容的元素ID }); function markdown() { var othis = $('.easyeditor-content'); var content = othis.html(); } }); </script> <script> //扫码阅读 $("#rdown").hover(function(){ $("#phonedl").show().stop(); },function(){ $("#phonedl").hide().stop(); }); $("#phonedl").hover(function(){ $("#phonedl").show().stop(); },function(){ $("#phonedl").hide().stop(); }); function PhoneDown(){ layer.open({ title: "扫码查阅", skin: 'layui-layer', content: "<img src='/qrcode/?text=https://www.xckfsq.com/article/detail.html?id=34217&size=230'>" }); } </script> </body> </html>