你不知道的web前端那些事，web前端要学习的知识有很多，前端基础要学习三个部分：HTML，CSS，JavaScript（简称JS），因此首先明确三个概念：HTML负责结构，网页想要表达的内容由html书写。 CSS负责样式，网页的美与丑由它来控制JS负责交互，用户和网页产生的互动由它来控制。
第一、学好基础知识，做一个基础扎实的开发者。在IT行业，每年都会有很多新的技术诞生并且得到广泛的推广，前端技术也不例外。所以无论学到多深的程度，扎实的基本功肯定是必不可少的。
（1）HTML：尽量掌握尽可能多的标签，必须掌握的标签有：、
、
、<body>、<h1>、<p>、<a>、<img>、<table>、<tr>、<td>、<th>、<form>、<input>、<select>、<option>、<textarea>、<div>、<span>、<script>、<link>、<meta>、<style>、<hr>、<br>等等。当然还有很多比较少用的标签，例如<lable><address><var>等，这些虽然平时比较少用甚至几乎不用，但是当你学到Boostrap框架时，你会发现Boostrap框架为这些标签赋予了特定的功能与外观。除此之外，新增了很多标签和属性，使得HTML语言更加强大。</p><p>（2）CSS：对各个属性以及一些属性之间结合使用的技巧应该多钻研。CSS能够统一有效地对页面的布局、字体等网页中的各个元素显示属性进行控制，可以方便快捷地实现精美的页面表现效果。</p><p>（3）CSS+div布局模式：许多布局模式的基础，也是大部分前端<a style="color:#333;" target="_blank" href="/soso.php?keyname=开发">开发</a>人员接触到的第一种布局方式。这种布局模式对于PC端页面的设计是非常有帮助的，同时对于后面将会遇到的“移动端布局”、“响应式布局”等，这种布局方式都具有一定的指导意义。</p><p>第二、将JavaScript作为前端学习的重点。JavaScript是目前大多数主流浏览器支持的面向对象的脚本语言，它可以在不与服务器交互的前提下对HTML的页面内容进行修改。JavaScript控制着网页的行为，决定着网页“做什么”。</p><p>第三、多练习多操作，实践是检验真理的唯一标准。IT编程是需要多加实践的，要不断反复进行上机操作，是学习编程开发的唯一方法。</p><p>第四、多归纳总结，透过现象看本质，前端需要学习的东西很多，知识点比较杂，如何记忆呢？这就需要大家多多归纳总结，例如可以把一些常用的代码写法记录下来。</p><p>欢迎大家在评论区评论留言，千锋重庆<a style="color:#333;" target="_blank" href="/soso.php?keyname=web">web</a>前端小编会及时给大家解答疑惑的</p><p><br/></p>
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window.location.href="/soso.php?keyname="+Fname;
}
});
newscrolltop();
});
function newscrolltop(){
var newtop = 0;
if($('._nav_footer').length > 0){
var topsize = $('._nav_footer').offset().top;
var footerheight = $('._nav_footer').height();
var topheight = $('.ctt-sider').innerHeight();
var bodyheight = $('body').innerHeight();
$(window).scroll(function(e){
newtop = $(this).scrollTop();
topsize = $('._nav_footer').offset().top;
bodyheight = $('body').innerHeight();
if((bodyheight - newtop - topheight) < footerheight + 100){
$('.ctt-main-left > .ctt-sider-follow').css({'position':'absolute','top':topsize-topheight-100})
}else{
$('.ctt-main-left > .ctt-sider-follow').css({'position':'fixed','top':0})
}
});
}
}
</script>
</div>
<input type="hidden" id="obj-id" value="2823601">
<script type="text/javascript" charset="utf-8" src="/admin_1/libs/ueditor/ueditor.parse.js"> </script>
<script type="text/javascript">
//分享头像展开
$("#J_post_share").on('click',function(){
var post_id = $(this).attr("data-id");
var p = $(this).attr("page");
$.ajax({
url:"/ajax_new/ajax_action.php?action=shares&id="+post_id+"&p="+p+"&num=30&t="+new Date().getTime(),
async:false,
dataType: "json",
success: function(result){
if(result.retCode=='0'){
var ht='';
for(var i=0;i < result.data.length;i++){
ht += '<a href="/user/'+result.data[i].user_id+'" target="_blank" title="'+result.data[i].display_name+'"><img src="https://img2.ctoutiao.com'+result.data[i].user_avatar.normal+'@!70x70" alt="'+result.data[i].display_name+'"></a>';
}
if(ht) $(".sharing-pictn").append(ht);
if(result.data.length==30){
$("#J_post_share").attr("page",parseInt(p)+1);
}else{
$("#J_post_share").hide();
}
}else{
}
}
});
});
//文章点赞
function like_post(em,obj_type,obj_id){
var like_count = $('#likess').find('i').text();
var type = $(em).hasClass("fabulousyes") ? 0 : 1;
if(type!=1){
ctt2019.tips('您已经赞过了！');
return false;
}
$.get("/ajax_new/ajax_action.php?action=like", {
obj_type: obj_type,
type: type,
obj_id: obj_id
}, function(result) {
if (result.is_error==0) {
if(type == 1){
$.cookie(result.key, result.val, { path:'/', expires:1});
$(em).addClass("fabulousyes");
$(em).find('img').fadeIn(500)
setTimeout(function(){
$('.fabulous').find('img').fadeOut()
},1000)
}else{
$.cookie(result.key, result.val, { path:'/', expires:1});
$(em).removeClass("fabulousyes");
}
$('#likess').find('i').text(parseInt(like_count)+1);
}else {
ctt2019.tips(result.msg);
return false;
}
},'json');
}
var i = 1;
// 收藏
function favorite(em,id){
if(i == 1){
i = 0;
if($("#comment_login").val()=='' ){
window.location.href="/auth/login.html";
return false;
}
//var fav_count = parseInt($(em).html());
type=$(em).attr("data");
$.get("/ajax_new/ajax_action.php?action=favorite", {
id: id,type:type
}, function(data) {
i=1;
if (data.is_error==0) {
if(type == '0'){
$(em).addClass("yessc");
$(em).attr("data","1");
}else{
$(em).removeClass("yessc");
$(em).attr("data","0");
}
if(data.nums==0){
$('#favo').text('');
}else{
$('#favo').text(data.nums);
}
}else {
ctt2019.tips(data.msg);
return false;
}
},'json');
}
}
//发布评论
function comment_submit(obj,comment_ID){
var rand = new Date();
var a = escape(rand);
var content = $("#say_"+comment_ID).val();
var sub_weibo = $("#sub_weibo").val();
var obj_id = $("#obj-id").val();
var obj_type = 'post';
var to_user = $(obj).attr('data-uid');
var comm_num = $('#comm_num').text();
if(!comm_num){
comm_num=0;
}
var comms = $('#comms').find('i').text();
if($("#comment_login").val()==''){
window.location.href="/auth/login.html";
return false;
}
if(content==""){
ctt2019.tips("请输入评论内容");
return false;
}
//更改发表按钮
$(obj).attr("onclick","javascript:;");
$(obj).html("提交中…");
$.post("/ajax_new/ajax_action.php?action=comment", {
a: a,
content: content,
obj_id: obj_id,
obj_type: obj_type,
comment_ID: comment_ID,
sub_weibo:sub_weibo,
to_user:to_user
}, function(data) {
if (data.is_error==0) {
ctt2019.tips("发布成功");
$(obj).attr("onclick","comment_submit(this,"+comment_ID+")");
$(obj).html("发表");
$("#say_"+comment_ID).val("");
$('#comm_num').text(parseInt(comm_num)+1);
$('#comms').find('i').text(parseInt(comms)+1);
$('#is_comment').find('i').text(parseInt(comms)+1);
get_comments('post',obj_id,1,6,1,1);
}else {
ctt2019.tips(data.msg);
$(obj).attr("onclick","comment_submit(this,"+comment_ID+")");
$(obj).html("发表");
return false;
}
},'json');
}
//点击评论查看更多
$("#J_cmt_more").on('click',function(){
var post_id = $(this).attr("post-id");
var p = $(this).attr("page");
var order = 6;
get_comments('post',post_id,p,order,0,0);
});
//评论点赞
$('#comment_list').on('click','.iconra',function(){
var num = $(this).find('em').text();
num = num ? num : 0;
var obj = $(this);
var id = $(this).attr("data");
if(obj.hasClass('upiconyes')){
ctt2019.tips("已点赞");
return false;
}else{
$.get('/ajax_new/ajax_action.php?action=like&obj_type=comment&obj_id='+id,function(res){
if(res.is_error == 0){
obj.addClass('upiconyes').find('em').text(++num);
}
},"json");
}
})
//评论查看更多
function get_comments(page,obj_id,p,order,type,method){
$.ajax({
url:"/ajax_new/ajax_data.php?page="+page+"&act=get_comments&obj_type="+page+"&obj_id="+obj_id+"&p="+p+"&order="+order+"&t="+new Date().getTime(),
async:false,
dataType: "json",
success: function(result){
if(result.is_error=='0'){
if(method=='1'){
$("#comment_list").html(result.data.fetch_data);
$("#J_cmt_more").attr("page",'2').text('查看更多');
}else{
$("#comment_list").append(result.data.fetch_data);
newscrolltop();
if(result.count < 10){
$("#J_cmt_more").html("没有更多评论了！");
if(type=='0'){
$("#J_cmt_more").attr("page",parseInt(p)+1);
}else{
$("#J_cmt_more").attr("page",'2');
}
}else{
if(type=='0'){
$("#J_cmt_more").attr("page",parseInt(p)+1);
}else{
$("#J_cmt_more").attr("page",'2');
}
}
}
}else{
$("#J_cmt_more").html("没有更多评论了！");
}
}
});
}
//关注
function dingyue(obj,color,part_type){
part_type = part_type ? part_type : '';
var id = $(obj).attr('data-id');
var type = $(obj).attr('data-type');
var uid = $.cookie('share_userid');
if(uid>0){
$.ajax({
url: '/custom.php?act=ding&id='+id+'&type='+type+'&part_type='+part_type,
dataType: "json",
success: function(result){
if(result.is_error==0){
$('.ct-follow').addClass('ct-yesfollow').text('已关注');
$('#is_ding').hide();
}else{
ctt2019.tips(result.msg);
}
}
});
}else{
window.location.href="/auth/login.html";
}
}
$(function(){
function daojishi(seconds,obj){
if (seconds < 300){
seconds++;
$(obj).text(seconds);
setTimeout(function(){
daojishi(seconds,obj);
},1000);
}
}
daojishi(1,'.onegg span')
//预置评论
$('.publish-labels .pub-one em').on('click',function(){
var id = $('#obj-id').val();
$.ajax({
url: '/ajax_new/ajax_data.php?page=cmt&id='+id,
dataType: "json",
success: function(result){
if(result){
var html = '';
for (var e in result) {//遍历json数组时，这么写p为索引，0,1
html += '<a href="javascript:;">'+result[e].note+'</a>';
}
$('.publish-labels .pub-two').html(html);
}else{
ctt2019.tips('服务器忙，请稍后再试');
}
}
});
});
$('.publish-labels .pub-one em').trigger("click");
$('.publish-labels .pub-two').on('click','a',function(){
var uid = $('#comment_login').val();
if(!uid){
window.location.href="/auth/login.html";
return false;
}else{
$('#say_0').val($('#say_0').val()+' '+$(this).text());
$('#say_0').focus();
}
});
//调整图片
$('.ctt-details-texts').find('img').css({'display':'block','max-width':'100%','height':'auto','margin':'0 auto'}).parent("p").css({'text-indent':'0'});
//解析样式
uParse('.ctt-details-texts',{
rootPath:'/admin_1/libs/ueditor',
liiconpath:'https://img2.ctoutiao.com/images/ueditor-list/'
});
// 相互评论
$('#comment_list').on('click','.iconrp',function(){
var uid = $('#comment_login').val();
if(!uid){
window.location.href="/auth/login.html";
return false;
}else{
if(!$(this).hasClass('yes')){
$(this).addClass('yes')
$(this).parents('.say-texts').find('.say-toyou').show()
}else{
$(this).parents('.say-texts').find('.say-toyou').hide()
$(this).removeClass('yes')
}
}
})
// 悬浮
var newtop = 0,lasttop = 0;
var lookheight = document.documentElement.clientHeight;
$(window).scroll(function(e){
var topsize = $('.navbar-wrapper').offset().top
newtop = $(this).scrollTop();
if((newtop+lookheight) > topsize){
$('.navbar-inner-box').removeClass('fiexd')
$('.navbar-inner-box').css({'transition': 'transform 500ms ease 0s', 'transform': 'translateY(0px)'});
}else{
$('.navbar-inner-box').addClass('fiexd')
if( lasttop <= newtop){//向下滚
$('.navbar-inner-box').css({'transition': 'transform 500ms ease 0s', 'transform': 'translateY(66px)'});
}else{//向上滚
$('.navbar-inner-box').css({'transition': 'transform 500ms ease 0s', 'transform': 'translateY(0px)'});
}
setTimeout(function(){lasttop = newtop;},0);
}
});
// 分享人数 展开
$('.sharing-click').on('click',function(){
if(!$(this).hasClass('yes')){
$(this).addClass('yes').text('收起').siblings().show()
}else{
$(this).removeClass('yes').text('展开').siblings().hide()
}
})
//判断是否点赞
var lkStr = $.cookie('like_posts');
if(lkStr){
var lkArr = lkStr.split(',');
if($.inArray($('#obj-id').val(), lkArr)!==-1){
$('.fabulous').addClass('fabulousyes');
};
}
//判断红包文章
var share_userid= $('#comment_login').val();
$.ajax({url:"/ajax_new/ajax_action.php?action=loadhobao&share_userid="+share_userid+"&post_id=2823601",
async:false,
dataType: "json",
success:function(msg){
var str='';
if(msg!=''){
str += "<a target='_blank' href='/"+msg[0].post_id+".html'; ><img src='/style/toutiao/img/hbbb.gif' alt='红包图标' /></a>";
$('#redpack').append(str);
for (var i = 0 ; i < msg.length; i++) {
if(msg[i].post_id=='2823601'){
$('#shares_icon').attr("class",'sharing-redbox');
}
}
}
}
})
})
</script>
</div>
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