gutenye / learn-feng Goto Github PK

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hello

HTML 49.03% JavaScript 33.38% CSS 17.60%

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class选择器

 #class1 div{

    background-color:red;
}

 div#class1{

    background-color:red;
}

//教材上说是第一种语法正确，但是在chrome中第二种可以，第一种不行，why

Transfer ownership

Transfer this repository to my account, for better management :) , here are steps:

Settings -> Transfer -> type learn-feng and gutenye -> I understand, transfer this repository.

做css时选颜色很头疼

颜色搭配什么处理

aa

s

<!DOCTYPE html>
<html >
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title></title>
<link rel="stylesheet" href="style.css">
</head>


<body >

<div id=main>


</div>


</body>

<script>

var name=sessionStorage.name;
alert(name);
alert(!undefined);
alert(!name);



</script>

</html>

aa

Use Google instead of Baidu

For programming staff, Baidu really can not help at all.

Here are some working Google Mirrors: https://github.com/6ag/Google-website

ajax终于不

需不需要花时间学精通

<div></div>里面没有内容或者有内容但没有在css中定义div的height的时候就不显示背景色，怎么解决

学html5有必要不

学Javascript, 没有遇到问题吗?

原来JavaScript这么简单呀.

document.querySelector("button").addEventListener("click", e => {
  console.log("You just clicked a button")
})

这个看的懂的吧.

感觉css和javascript基本入门了，你推荐个网站让我模拟实现练练手

js调试

编写好html+js文件后我用chrome试验效果，有没有好的调试工具？

thorny

//html

<div id=id3>
<div id=id4></div>
<div id=id5></div>
</div>


//style.css
#id3{
width:800px;
height:200px;
    position:relative;
    background-color:#699;

}
#id4{
    width:50px;
    height:50px;
    background-color:red;
position:absolute;
left:0px;
top:0px;
}
#id5{
    width:50px;
    height:50px;
    background-color:green;
    position:absolute;
    left:0px;
    top:150px;

}

//js
alert(document.getElementById("id4").style.left);           //null
document.getElementById("id4").style.left="0px";
alert(document.getElementById("id4").style.left);          //0px

//
在外部css文件中已经定义了left的值了，为什么输出null？（从网页输出布局来看position  left  top等值都已经起到作用了)

js

...javascript
var a={
name:"fcy",
fun:function()
{
alert(this.name);
}
}
...

this问题

<!DOCTYPE html>
<html>
<head>
<title>fcy</title>
<link rel="stylesheet" href="style.css">
</head>



<script>
/*
function fun1(node){
document.getElementById("placeholder").setAttribute("src",node.getAttribute("href"));
document.getElementById("caption").childNodes[0].nodeValue=node.getAttribute("title")
}


*/


function fun1(){
alert(this.id);
}

function fun2(){}
function fun3(){}

</script>



<body >

<div id=id1 style="width:50px;height:50px;border:1px solid red;"onclick="fun1()"></div>
<div id=id2 style="width:50px;height:50px;border:1px solid blue;" onclick="fun2()"></div>
<div id=id3 onclick="fun3()">
</div>

<!--
<div style="height:100px;background-color:transparent">
<ul style="list-style-type:none">

<li>
<a href="./pic/1.jpg" onclick="fun1(this); return false;" title=11> one</a>
</li>
<li>
<a href="./pic/2.jpg" onclick="fun1(this); return false;" title=22>  two</a>
</li>
<li>
<a href="./pic/3.jpg" onclick="fun1(this); return false;" title=33>  three</a>
</li>
<li>
<a href="./pic/4.jpg" onclick="fun1(this); return false;" title=44>  four</a>
</li>


</div>
<div style="width:800px;height:800px;">
<img id="placeholder" alt="beauty" style="height:800px;width:800px;"></img>
<p id=caption>pic</p>
</div>

-->


</body>



</html>

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