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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script type="text/javascript">
/*window.onload= function(){
var bjnObj = document.getElementById("btn01");
bjnObj.onclick=function d (){
alert("合法");
}
}
window.onload= function(){
var btnObj = document.getElementById("btn02");//定义对象
// alert(btnObj);
btnObj.onclick = function a (){//定义方法
alert("动态点击");
}
}*/
// var patt =new RegExp("1");和下面的写法相同正则表达式
//var patt =/e/;
// alert(patt)
// var str = "abe1cd";
//alert(patt.test(str));
function onclickFun(){
var newObj =document.getElementById("newObj");
//alert(newObj.value);
var usernameText =newObj.value;
//验证文本是否合法
var patt =/^\w{5,12}$/;//5-12个字符串正则表达式
/*test()方法用于测试某个字符串是否匹配*/
var usenaemspanObj = document.getElementById("usenaemspan");{
//alert(usenaemspanObj.innerHTML);//innerHTML表示标签中的内容
usenaemspanObj.innerHTML="标签修改"//可读可写可赋值
}
if(patt.test(usernameText)){
alert("用户名合法");
usenaemspanObj.innerHTML="<img src=\"../images/123.png\" width=\"20\" height=\"20\">"//在此处需要转义
}
else{
alert("用户名不合法");
usenaemspanObj.innerHTML="<img src=\"../images/123.png\" width=\"40\" height=\"40\">"//vsc在此处需要转义
}
}
function checkAll(){//同一个js写全才不报错
var hobbies = document.getElementsByName("hobby");//name返回元素集合
//alert(hobbies.length);返回个数
//alert(hobbies[0].value);//input cpp
//集合中每个元素都是dom对象 有序
//checked="checked"选中状态 checked可读可选
for(var i = 0; i < hobbies.length ; i++){
hobbies[i].checked=true;
}
}//全选
function checkNO()
{
var hobbies = document.getElementsByName("hobby");//name返回元素集合
for(var i = 0; i < hobbies.length ; i++){
hobbies[i].checked=false;
}
}//全不选
function checkReverse(){
var hobbies = document.getElementsByName("hobby");//name返回元素集合
for(var i = 0; i < hobbies.length ; i++){
hobbies[i].checked = !hobbies[i].checked;//比if更容易判断
/*if(hobbies[i].checked==false)
hobbies[i].checked=true;
else
hobbies[i].checked=false;*/
}
}//反选
function checkAll1()
{
var hobbies =document.getElementsByTagName("input")//指定标签名查询并返回集合
for(var i = 0; i < hobbies.length ; i++){
hobbies[i].checked = !hobbies[i].checked;//比if更容易判断
/*if(hobbies[i].checked==false)
hobbies[i].checked=true;
else
hobbies[i].checked=false;*/
}
}//反选
//创建标签
window.onload=function(){
var divObj = document.createElement("div");
divObj.innerHTML ="白筱1231321";
document.body.appendChild=("divObj")
}
</script>
<title>DOM模型</title>
</head>
<body>
<a href="www.white-x.top">白筱</a>
<h1 align=center>标题</h1>
用户名<input type="text" id="newObj" value="">
<span style="color: red;" id="usenaemspan"></span>
<button onclick="onclickFun()">校验</button><br>
<input type="checkbox" name="hobby" value="cpp">cpp
<input type="checkbox" name="hobby" value="java">java
<input type="checkbox" name="hobby" value="js">js
<input type="checkbox" name="hobby" value="python">python
<br>
<button onclick="checkAll()">全选</button>
<button onclick="checkNO()">全不选</button>
<button onclick="checkReverse()">反选</button>
<br>
<input type="checkbox" value="cpp">1
<input type="checkbox" value="java">2
<input type="checkbox" value="js">3
<input type="checkbox" value="python">4
<button onclick="checkAll1()">反选</button>
</body>
</html>
|