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DOM及其应用
2022-08-05 05:13:00 【长路漫漫 大佬为伴】
1.编写一个登录页面,在客户端检验用户名和密码是否符合规范。
账户为:123
密码为:456
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<form action="https://www.baidu.com/" onsubmit="return fn()">
<input type="text" name="userName" />
<input type="password" name="passWord" />
<button type="submit" >点我</button>
</form>
<script>
function fn() {
var flag=true;
var myUserName = document.querySelectorAll("input")[0];
var myPassWord = document.querySelectorAll("input")[1];
if (myUserName.value == "123") {
if (myPassWord.value == "456") {
alert("验证成功");
return flag;
}
else {
flag = false;
alert("密码错误,请重新输入");
return flag;
}
}
else {
flag = false;
alert("用户名错误,请重新输入!");
return flag;
}
}
</script>
</body>
</html>
运行截图:

2.编写一个表格组件。要求二维表数据与表格显示分离,不使用任何框架。本题可作为课程考核开发项目。
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<script type="text/javascript">
window.onload = function(){
//增加行
var btn = document.getElementById("a");
btn.onclick = function(){
var table = document.getElementsByTagName("table")[0];
add(table,"tr");
}
//删除行
var a = document.getElementsByTagName("a");
for(var i=0;i<a.length;i++){
a[i].onclick =function(){
var parentTwo = this.parentNode.parentNode;
var parentThree = parentTwo.parentNode;
remove(parentTwo,parentThree);
}
}
//鼠标移动修改颜色
var tr = document.getElementsByTagName("tr");
for(var i=0;i<tr.length;i++){
tr[i].onmouseover = function(){
background(this,"red");
};
tr[i].onmouseout = function(){
background(this,"white");
}
}
};
//改变颜色的函数
function background(obj,target){
obj.style.background = target;
}
//删除的函数
function remove(two,three) {
three.removeChild(two);
}
//增加行中删除操作的函数
function remover(obj) {
var remove1=document.getElementById('table').childNodes[1];
var remove2=obj.parentNode.parentNode;
remove1.removeChild(remove2);
}
//增加行的函数
function add(parent,child) {
var newone=document.createElement("tr");//新增行
newone.onmouseover = function(){
background(this,"red");
};
newone.onmouseout = function(){
background(this,"white");
};
var newone1=document.createElement("td");
newone1.innerHTML="<td />";
newone.appendChild(newone1);
var newone2=document.createElement("td");
newone2.innerHTML="<td />";
newone.appendChild(newone2);
var newone3=document.createElement("td");
newone3.innerHTML="<a href='javascript:;' οnclick='remover(this)' >删除</a>";
newone.appendChild(newone3);
document.getElementById("table").childNodes[1].appendChild(newone);
}
</script>
</head>
<body>
<table border="1" width="50%" id="table">
<tr>
<th>学号</th>
<th>姓名</th>
<th>操作</th>
</tr>
<tr>
<td>001</td>
<td>张三</td>
<td><a href="javascript:;" >删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
<tr>
<td>002</td>
<td>李四</td>
<td><a href="javascript:;" >删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
</table>
<input id ="a" type="button" value="添加一行" /> <!--在添加按钮上添加点击事件 -->
</body>
</html>
运行截图:
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