• JS之DOM


    HTMLdom和COREdom

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>HTMLdom</title>
    </head>
    <body>
    <table id="myTable" border="1" width="400px" height="100px" style="border-collapse: collapse">
        <tr>
            <td>书名</td>
            <td>价格</td>
            <td>操作</td>
        </tr>
        <tr id="tr1">
            <td>看的见风景的房间</td>
            <td>¥30</td>
            <td>
                <button onclick="removeRow(this)">删除</button>
            </td>
        </tr>
        <tr>
            <td>幸福从天而降</td>
            <td>¥18.5</td>
            <td>
                <button onclick="removeRow(this)">删除</button>
            </td>
        </tr>
        <tr>
            <td>60个瞬间</td>
            <td>¥32</td>
            <td>
                <button onclick="removeRow(this)">删除</button>
            </td>
        </tr>
    </table>
    <button onclick="insert1()">增加一行</button>
    <button onclick="delete2()">删除第2行</button>
    <button onclick="changeTitle()">修改标题</button>
    </body>
    <script>
        function insert1() {
            /*/!*1:core Dom*!/
             var tr = document.createElement("tr");
             var td1 = document.createElement("td");
             td1.innerHTML = "钢铁是怎么炼成的";
             var td2 = document.createElement("td");
             td2.innerHTML = "¥50";
             tr.appendChild(td1);
             tr.appendChild(td2);
             var table1 = document.getElementById("myTable");
             var tr1 = document.getElementById("tr1");
             table1.firstElementChild.insertBefore(tr,tr1);*/
    
            /*2:html Dom*/
            var table = document.getElementById("myTable");
            var row = table.insertRow(2);                       //定义一行,2是从上数012,就是第三行增加一行
            var cell1 = row.insertCell(0);
            var cell2 = row.insertCell(1);                      //增加两个单元格
            cell1.innerHTML = "钢铁是怎样炼成的";
            cell2.innerHTML = "$50";
        }
        function delete2() {
            /*core DOM*/
            /*var tr1 = document.getElementById("tr1");
             var table = document.getElementById("myTable");
             table.firstElementChild.removeChild(tr1);*/
    
            /*HTML DOM*/
            var table = document.getElementById("myTable");
            table.deleteRow(1);
        }
        function changeTitle() {
            var table = document.getElementById("myTable");
            table.rows[0].cells[0].align = "center";
            table.rows[0].cells[1].align = "center";
        }
    
        function removeRow(obj) {
            var index = obj.parentNode.parentNode.rowIndex;
            var table = document.getElementById("myTable");
            table.deleteRow(index);
        }
    </script>
    </html>

    鼠标事件

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>鼠标事件</title>
    </head>
    <body>
    <button onclick="myClick()">鼠标单击</button>
    <button ondblclick="myDBClick()">鼠标双击</button>
    <button onmousedown="myMouseDown()" onmouseup="myMouseUp()">鼠标按下和抬起</button>
    <button onmouseover="myMouseOver()" onmouseout="myMouseOut()">鼠标悬浮和离开</button>
    <button onmousemove="myMouseMove()">鼠标移动</button>
    <button onmouseenter="myMouseEnter()" onmouseleave="myMouseLeave()">鼠标进入和离开</button>
    </body>
    <script>
        function myClick() {
            console.log("你单击了按钮!");
        }
        function myDBClick() {
            console.log("你双击了按钮!");
        }
        function myMouseDown() {
            console.log("鼠标按下了!");
        }
        function myMouseUp() {
            console.log("鼠标抬起了!");
        }
        function myMouseOver() {
            console.log("鼠标悬浮!");
        }
        function myMouseOut() {
            console.log("鼠标离开!")
        }
        function myMouseMove() {
            console.log("鼠标移动!")
        }
        function myMouseEnter() {
            console.log("鼠标进入!")
        }
        function myMouseLeave() {
            console.log("鼠标离开!")
        }
    
    </script>
    </html>

    键盘事件

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>键盘事件</title>
    </head>
    <body>
    <input id="name" type="text" onkeydown="myKeyDown(this.id)" onkeyup="myKeyUp(this.id)">
    </body>
    <script>
        /*输出输入的字符*/
        function myKeyDown(id) {
            console.log(document.getElementById(id).value);
        }
        /*按键结束,字体转换为大写*/
        function myKeyUp(id) {
            var text = document.getElementById(id).value;
            document.getElementById(id).value = text.toUpperCase();
        }
        /*还有个keypress:某个按键被按下并松开,与keydown对应*/
    </script>
    </html>

    HTML事件

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <!--<script>
            function loaded() {
                var name1 = document.getElementById("name");
                name1.onclick = function () {
                    alert("洗刷刷");
                }
            };
        </script>-->
        <style>
            #container{
                height: 1000px;
                background-color: aqua;
            }
        </style>
        <title>HTML事件</title>
    </head>
    <body onload="loaded()">
    <input type="text" id="name" onselect="mySelect(this.id)">
    <input type="text" id="name2" onchange="myChange(this.id)">
    <input type="text" id="name3" onfocus="myFocus()">
    <div id="container"></div>
    </body>
    <script>
        window.onload = function () {
          console.log("文档加载完毕!");
        };
        /*window.onunload = function () {
            alert("文档被关闭!");
        };*/
        function mySelect(id) {
            var text = document.getElementById(id).value;
            console.log(text);
        }
        function myChange(id) {
            var text = document.getElementById(id).value;
            console.log(text);
        }
        function myFocus() {
            console.log("得到光标!");
        }
        window.onresize = function () {
            console.log("窗口变化!")
        };
        var name1 = document.getElementById("name");
        name1.onclick = function () {
            alert("洗刷刷");
        };
        window.onscroll = function () {
            console.log("滚动条滚动")
        }
    
    </script>
    </html>

    事件模型

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>事件模型</title>
    </head>
    <body>
    <!--脚本模型:行内绑定-->
    <button onclick="javascript:alert('Hello')">Hello!</button>
    
    <!--内联模型-->
    <button onclick="showHello()">Hello2!</button>
    
    <!--动态绑定-->
    <button id="btn3">Hello3!</button>
    </body>
    <script>
        /*内联模型*/
        function showHello() {
            alert("Hello");
        }
    
        /*动态绑定*/
        var btn3 = document.getElementById("btn3");
        /*DOM0:
         同一个元素,同类事件只能添加一个;
         如果添加多个,后面添加的会覆盖之前添加的*/
        /*btn3.onclick =function () {
         alert("hello")
         };
         btn3.onclick =function () {
         alert("hello5")
         };*/
    
        /*DOM2:
         可以给同一个元素添加多个同类事件*/
        /*btn3.addEventListener("click", function () {
         alert("Hello1")
         });
         btn3.addEventListener("click", function () {
         alert("Hello2")
         });*/
        /*DOM0与DOM2可以运行看看差别就明白了*/
    
        /*不同浏览器的兼容写法*/
        if (btn3.attachEvent()) {/*IE*/
            btn3.attachEvent("onclick", function () {
                alert("IE hello")
            });
        } else {                    /*W3C*/
            btn3.addEventListener("click", function () {
                alert("W3C hello")
            })
    </script>
    </html>

    事件冒泡及捕获

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <style>
            #div1 {
                width: 400px;
                height: 400px;
                background-color: red;
            }
    
            #div2 {
                width: 300px;
                height: 300px;
                background-color: yellow;
            }
    
            #div3 {
                width: 200px;
                height: 200px;
                background-color: blue;
            }
    
            #div4 {
                width: 100px;
                height: 100px;
                background-color: #4D2E83;
            }
    
        </style>
        <title>事件冒泡</title>
    </head>
    <body>
    <div id="div1">
        <div id="div2">
            <div id="div3">
                <div id="div4">
    
                </div>
            </div>
        </div>
    </div>
    </body>
    <script>
        /*事件冒泡:事件的触发方向是从子元素往父元素
                    子元素的事件发生以后,会引发父元素同类事件
         * 事件捕获:事件的触发方向是从父元素往子元素                 在每个var后边加了个,true*/
        /*var div1 = document.getElementById("div1");
        div1.addEventListener("click", function () {
            alert("div1")
        }, true);
        var div2 = document.getElementById("div2");
        div2.addEventListener("click", function () {
            alert("div2")
        }, true);
        var div3 = document.getElementById("div3");
        div3.addEventListener("click", function () {
            alert("div3")
        }, true);
        var div4 = document.getElementById("div4");
        div4.addEventListener("click", function () {
            alert("div4")
        }, true);*/
    
    
    
    
        /*在function里面加event,后边加event.stopPropagation();就使得事件冒泡结束*/
        var div1 = document.getElementById("div1");
        div1.addEventListener("click", function () {
            alert("div1")
        });
        var div2 = document.getElementById("div2");
        div2.addEventListener("click", function (event) {
            event.stopPropagation();
            alert("div2")
        });
        var div3 = document.getElementById("div3");
        div3.addEventListener("click", function (event) {
            event.stopPropagation();
            alert("div3")
        });
        var div4 = document.getElementById("div4");
        div4.addEventListener("click", function (event) {
            event.stopPropagation();
            alert("div4")
        });
    </script>
    </html>

    阻止默认事件

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>阻止默认事件</title>
    </head>
    <body>
    <a href="https://www.baidu.com" onclick="stopA(event)">baidu</a>
    </body>
    <script>
        /*阻止超链接的默认事件*/
        function stopA(event) {
            if (event.preventDefault()){
                event.preventDefault();         //W3C
            }else{
                event.returnValue=false;        //IE
            }
            alert("老子就是不让你跳转")
        }
    </script>
    </html>
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  • 原文地址:https://www.cnblogs.com/haloxinghong/p/7307716.html
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