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Web从入门到放弃<5>

<1> CSS_DOM

1,structural layer

2,presentation layer

3,behavior layer

style也是一个属性

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p id="text" style="background-color: #222222;color: white;">Hello World</p>
<script src="cp_10.js"></script>
</body>
</html>

js:

function someTest() {
    var text = document.getElementById('text');
    console.log(typeof text,"text:",text);
    console.log(typeof text.nodeName , "nodeName:",text.nodeName);
    console.log(typeof text.style ,"style:",text.style);

}
someTest();

output:

获取样式属性:

color="white"

alert(text.style.color);

color:#cc6600;

<2>设置样式的各种方法:

这样的并不好，需要外部文件分离:

如果要设置文档所有的<p> 元素CSS:

p{
    background-color: #333333;
    color: white;
}

如果要设置文档id为text的<p>元素 CSS:

p#text{
    background-color: #333333;
    color: white;
}

如果要设置文档id为text的元素CSS:

#text{
    background-color: #333333;
    color: white;
}

如果要设置文档class为textClass的元素CSS:

.textClass{
    background-color: #333333;
    color: white;
}

但是这样的方式在DOM中会无法获取样式,不过在DOM里设置可以.

window.onload= function () {
    var text = document.getElementById('text');
    text.style.backgroundColor="#222222";
    text.style.color = "white";
}

<3>只设置h1下一个节点的样式:

html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>This is a Test</h1>
<p>"HelloWorld"</p>
<h1> <em>Test</em> Houdini VFX </h1>
<p>"HelloWorld"</p>
<script src="cp_10_03.js"></script>
</body>
</html>

View Code

js:

var headers = document.getElementsByTagName('h1');
for(var i=0;i<headers.length;i++){
    console.log(headers[i],"**type is*:" , headers[i].nodeType);
    console.log('nextSibling:',headers[i].nextSibling.nodeType , "data is:" , headers[i].nextSibling);
    //console.log("getNextElement:",getNextElement(headers[i].nextSibling));
    var elm = getNextElement(headers[i].nextSibling);
    console.log("Find element :" , elm);
    elm.style.color = "#888888";
    elm.style.backgroundColor = "black";
    elm.style.fontWeight = "bold";

}


function getNextElement(node)
{
    if(node.nodeType===1){
        return node;
    }
    if(node.nextSibling){
        return getNextElement(node.nextSibling);
    }
    return null;
}

View Code

<4> 表格:

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" media="screen" href="cp_11_01.css">
</head>
<body>

<table>
    <caption>Types</caption>
    <thead>
    <tr>
        <th>Houdini</th>
        <th>Support</th>
    </tr>
    </thead>

    <tbody>
    <tr>
        <td>Dop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Animation</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Compile JIT</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Rop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Cop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>FileSystem</td>
        <td>No</td>
    </tr>
    </tbody>


    <tfoot>
    <tr>
        <td>suggestions</td>
        <td>strongly recommend</td>
    </tr>
    </tfoot>

</table>


</body>
</html>

View Code

CSS:

body{
    font-family: Consolas;
    background-color: #333333;
    color:white;
}

table{
    margin: auto;  /*set this will show table in center*/
    border: 3px solid #699;
}

caption{
    margin: auto;
    padding: 0.2em;
    font-size: 1.2em;
    font-weight: bold;
}
th{
    font-weight:normal;
    font-style: italic;
    text-align: left;
    border: 1px dotted #699;
    background-color: #9cc;
    color:black;
}
th,td{
    width: 10em;
    padding:0.5em;
}

tr:hover{
    background-color: #cccccc;
}

/*
tr:nth-child(odd){
    background-color: #9cc;
}
tr:nth-child(even){
    background-color: #922;
}
*/

View Code

要做一个奇偶颜色交替变换CSS带了一种:

tr:nth-child(odd){
    background-color: #9cc;
}
tr:nth-child(even){
    background-color: #922;
}

但是 thread标签里的也被改了:因为thread第一个是0...然后从<tbody> </tbody>开始正常了。。。到最后的<tfoot><tfoot>又抽风。。解决重复的问题必须用javascript

正确姿势的javascript:

function addUniqueColor(){
    var tables = document.getElementsByTagName('table');
    if(tables.length<1)return false;
    for(var i=0;i<tables.length;i++){
        var current_table = tables[i];

        // only set <tbody></tbody>
        var tbodys = current_table.getElementsByTagName('tbody');
        if (tbodys.length<1)
            continue;
        // find tbody's tr
        for(var j=0;j<tbodys.length;j++){
            var current_tbody = tbodys[j];
            var targetTrs = current_tbody.getElementsByTagName('tr');
            if(targetTrs.length<1) continue;
            var odd = false;
            for(var k=0;k<targetTrs.length;k++){
                if(odd === false) {
                    targetTrs[k].style.backgroundColor = '#444444';
                    odd = true;
                }
                else
                {
                    targetTrs[k].style.backgroundColor = '#222222';
                    odd = false;
                }

            }
        }
    }
}

View Code

不过Hover丢失了,解决办法用事件:

书中给的方法:

elm.onmouseover = function(){}

elm.onmouseout = function(){}

根据qml命名使用也一样...

elm.onmouseenter= function(){}

elm.onmouseleave= function(){}

html里特意增加了两个表格，测试代码准确性：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" media="screen" href="cp_11_01.css">
</head>
<body>

<table>
    <caption>Types</caption>
    <thead>
    <tr>
        <th>Houdini</th>
        <th>Support</th>
    </tr>
    </thead>

    <tbody>
    <tr>
        <td>Dop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Animation</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Compile JIT</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Rop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Cop</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>FileSystem</td>
        <td>No</td>
    </tr>
    </tbody>


    <tfoot>
    <tr>
        <td>suggestions</td>
        <td>strongly recommend</td>
    </tr>
    </tfoot>

</table>


<table>
    <caption>Types</caption>
    <thead>
    <tr>
        <th>Maya</th>
        <th>Support</th>
    </tr>
    </thead>

    <tbody>
    <tr>
        <td>Dop</td>
        <td>No</td>
    </tr>
    <tr>
        <td>Animation</td>
        <td>Yes</td>
    </tr>
    <tr>
        <td>Compile JIT</td>
        <td>No</td>
    </tr>
    <tr>
        <td>Rop</td>
        <td>No</td>
    </tr>
    <tr>
        <td>Cop</td>
        <td>No</td>
    </tr>
    <tr>
        <td>FileSystem</td>
        <td>No</td>
    </tr>
    </tbody>


    <tfoot>
    <tr>
        <td>suggestions</td>
        <td>Not recommend</td>
    </tr>
    </tfoot>

</table>

<script src="cp_11_01.js"></script>
</body>
</htm

View Code

js:

function addUniqueColor(){
    var odd = {"falseColor":'#444444', "trueColor":"#222222" , "hoverColor":"#cccccc"};
    var tables = document.getElementsByTagName('table');
    if(tables.length<1)return false;
    for(var i=0;i<tables.length;i++){
        var current_table = tables[i];

        // only set <tbody></tbody>
        var tbodys = current_table.getElementsByTagName('tbody');
        if (tbodys.length<1)
            continue;
        // only find tbody's tr
        for(var j=0;j<tbodys.length;j++){
            var current_tbody = tbodys[j];
            var targetTrs = current_tbody.getElementsByTagName('tr');
            if(targetTrs.length<1) continue;
            var state = false;
            var mapping = [];
            for(var k=0;k<targetTrs.length;k++) {
                // give unique color
                if(state === false) {
                    targetTrs[k].style.backgroundColor = odd.falseColor;
                    mapping[k] = odd.falseColor;
                    // set the leave event also follow default color
                    targetTrs[k].onmouseleave = function () {
                        this.style.backgroundColor = odd.falseColor;
                    };
                    state = true;
                }
                else {
                    targetTrs[k].style.backgroundColor = odd.trueColor;
                    // set the leave event also follow default color
                    targetTrs[k].onmouseleave = function () {
                        this.style.backgroundColor = odd.trueColor;
                    };
                    state = false;
                }

                // set the enter event
                targetTrs[k].onmouseenter = function () {
                    onMouseIn(this,odd);
                };
            }
        }
    }

}



function addOnLoadEvent(func) {
    var oldEvent = window.onload ;
    if(typeof window.onload !== "function"){
        window.onload = func;
    }
    else{
        window.onload = function () {
            oldEvent();
            func();
        }
    }
}

function onMouseIn(node , odd) {
    console.log('mouse In:',node ,odd);
    node.style.backgroundColor = odd.hoverColor;
}


addOnLoadEvent(addUniqueColor);

View Code

<4> Javascript DOM 动画API

一个简单的CSS , XY控制方法

h1{
    position: absolute;
    top:60px;
    left: 100px;
}

转换成javascript

function addLoadEvent(func) {
    var oldEvent = window.onload;
    if(typeof window.onload !== "function"){
        window.onload = func;
    }
    else{
        window.onload=function () {
            oldEvent();
            func();
        }
    }
}

function positionMessage() {
    if(!document.getElementById){return false;}
    if(!document.getElementById('message')){return false;}
    var elm = document.getElementById('message');
    elm.style.position = 'absolute';
    elm.style.top = '50px';
    elm.style.left = '150px';
}

addLoadEvent(positionMessage);

关键函数:

1.var handleNum = setTimeOut("function",time);

2,clearTimeOut(handleNum)

3,parseInt(),parseFloat()

js代码:假如一个movemessage函数，调用方法似乎放到positionMessage函数里，设置1000ms,也就是1秒后，会进入moveMessage()函数。

这段代码像一个时间事件一样从positionMessage() 函数跳入moveMessage()函数，并没有什么迭代过程。。。

function addLoadEvent(func) {
    var oldEvent = window.onload;
    if(typeof window.onload !== "function"){
        window.onload = func;
    }
    else{
        window.onload=function () {
            oldEvent();
            func();
        }
    }
}

function positionMessage() {
    if(!document.getElementById){return false;}
    if(!document.getElementById('message')){return false;}

    var elm = document.getElementById('message');
    elm.style.position = 'absolute';
    elm.style.top = '50px';
    elm.style.left = '150px';

    var movement = setTimeout("moveMessage()",1000);
    //clearTimeout(movement);
}

function moveMessage() {
    if(!document.getElementById){return false;}
    if(!document.getElementById('message')){return false;}

    var elm = document.getElementById('message');
    elm.style.position = 'absolute';
    elm.style.top = '150px';
    elm.style.left = '250px';
}


addLoadEvent(positionMessage);

View Code

一个简单的动画:

将var movement = setTimeout("moveMessage()",10); 放入moveMessage()函数体呢，

就变成了每次执行moveMessage()，都会启用setTimeOut()函数。然后变成循环函数。

function addLoadEvent(func) {
    var oldEvent = window.onload;
    if(typeof window.onload !== "function"){
        window.onload = func;
    }
    else{
        window.onload=function () {
            oldEvent();
            func();
        }
    }
}

function positionMessage() {
    if(!document.getElementById){return false;}
    if(!document.getElementById('message')){return false;}

    var elm = document.getElementById('message');
    elm.style.position = 'absolute';
    elm.style.top = '50px';
    elm.style.left = '150px';

    //var movement = setTimeout("moveMessage()",1000);
    //clearTimeout(movement);
}

function moveMessage() {
    if(!document.getElementById){return false;}
    if(!document.getElementById('message')){return false;}

    var elm = document.getElementById('message');
    var xpos = parseInt(elm.style.left);
    var ypos = parseInt(elm.style.top);
    if(xpos === 200 && ypos === 200){
        return true;
    }

    if(xpos<200){xpos++;}
    if(xpos>200){xpos--;}
    if(ypos<200){ypos++;}
    if(ypos>200){ypos--;}

    console.log("current position xy:",xpos,ypos);
    elm.style.left = xpos + 'px';
    elm.style.top = ypos + 'px';
    var movement = setTimeout("moveMessage()",10);
}


addLoadEvent(positionMessage);
addLoadEvent(moveMessage);

View Code

显示<a> 的缩略图,其中有一点使用了clearTimeOut() ,并且修改了moveElement()函数。其中的时间事件每次清理。

html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="web_design.css"/>
</head>
<body>

<h1> Web Design</h1>

<ol id="linklist">
    <li> <a href="#">structure</a> </li>
    <li> <a href="#">presentation</a> </li>
    <li> <a href="#">behavior</a> </li>

</ol>

<div id="slideshow">
    <img src="images/topics.jpg" alt="building blocks of web design" id="preview"/>
</div>
<script src="web_design.js"></script>
</body>
</html>

View Code

js:

function addLoadEvent(func) {
    var oldFunc = window.onload;
    if(typeof window.onload !== "function"){
        window.onload = func;
    }
    else{
        window.onload = function (ev) {
            oldFunc();
            func();
        }
    }
}

function eventsLinks()
{
    var links = document.getElementsByTagName('a');
    var preview = document.getElementById('preview');
    if(!links)return false;
    if(!preview) return false;

    console.log(links);
    links[0].onmouseover = function () {
        moveElement('preview',-100,0,0)
    };
    links[1].onmouseover = function () {
        moveElement('preview',-200,0,0)
    };
    links[2].onmouseover =function () {
        moveElement('preview',-300,0,0)

    };


}



function moveElement(elementID,final_x,final_y,phase) {
    var elm = document.getElementById(elementID);
    if(!elm)return false;

    // if have time handel clear it
    if(elm.movement) clearTimeout(elm.movement);

    // if left and top attribute do not exist
    if(!elm.style.left) elm.style.left = '0px';
    if(!elm.style.top) elm.style.top = '0px';

    //
    var xpos = parseInt(elm.style.left);
    var ypos = parseInt(elm.style.top);
    if(xpos === final_x && ypos===final_y) return true;
    // x motion
    if(xpos>final_x) xpos = xpos - Math.ceil((xpos - final_x) / 10);
    if(xpos<final_x) xpos = xpos + Math.ceil((final_x - xpos) / 10);
    // y motion
    if(ypos>final_y) ypos = ypos - Math.ceil((ypos-final_y) / 10);
    if(ypos<final_y) ypos = ypos + Math.ceil((final_y-ypos) / 10);

    elm.style.left = xpos + 'px';
    elm.style.top  = ypos + 'px';

    var repeat = "moveElement('"+elementID+"',"+final_x+", "+final_y+" , "+phase+")";
    console.log("repeat command:",repeat);
    elm.movement  = setTimeout(repeat,phase);
}

addLoadEvent(eventsLinks);

View Code

css:

body{
    font-family: Consolas;
}


#slideshow{
    width: 100px;
    height:100px;
    position: absolute;
    overflow: hidden;
}
#preview{
    left:0px;
    top: 0px;
    position: absolute;
}

View Code

...

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原文地址：https://www.cnblogs.com/gearslogy/p/8143795.html