h5-2

时间:2022-04-13 05:53:12
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
//document.getElementById();
//document.getElementsByTagName();
//$('#div1') $('.box') $('ul li')
window.onload = function(){
//var oDiv = document.querySelector('[title=hello]');
var oDiv = document.querySelector('.box'); //只能选择一组中的第一个元素
//alert( oDiv.length );
oDiv.style.background = 'red';
};
</script>
</head> <body>
<div id="div1" class="box" title="hello">div</div>
<div class="box">div2</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
//document.getElementById();
//document.getElementsByTagName();
//$('#div1') $('.box') $('ul li')
window.onload = function(){
var aDiv = document.querySelectorAll('.box'); //获取一组元素
alert( aDiv.length );
}; </script>
</head> <body>
<div id="div1" class="box" title="hello">div</div>
<div class="box">div2</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script> window.onload = function(){ var aDiv = document.getElementsByClassName('box'); alert( aDiv.length ); }; </script>
</head> <body>
<div id="div1" class="box" title="hello">div</div>
<div class="box">div2</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script> window.onload = function(){
var oDiv = document.getElementById('div1'); //alert( oDiv.classList ); //类似与数组的对象,box1 box2 box3 //alert( oDiv.classList.length ); //3 //oDiv.classList.add('box4'); //oDiv.classList.remove('box2'); oDiv.classList.toggle('box2');//class列表中有box2就删除没有就添加。 }; </script>
</head> <body>
<div id="div1" class="box1 box2 box3">div</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script> //eval : 可以解析任何字符串变成JS(安全低,把病毒字符串能解析成js)
//parse : 只能解析JSON形式的字符串变成JS (安全性要高一些) var str = 'function show(){alert(123)}';
eval(str);//把字符串转成js了,
show();//有弹出 var str = 'function show(){alert(123)}';
JSON.parse(str);//不能转成js
show();//没有弹出 var str = '{"name":"hello"}'; //一定是严格的JSON形式
var json = JSON.parse(str);
alert( json.name ); var json = {name : "hello"};//一个对象,{}就是一个对象。
var str = JSON.stringify(json);//str = '{"name":"hello"}'
alert( str );// {"name":"hello"} </script>
</head> <body>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="json2.js"></script> //引入js文件
<script> /*
var a = {//a对象
name : 'hello'
};
var b = a;
b.name = 'hi';
alert( a.name );//hi var a = {
name : 'hello'
};
var b = {};
for(var attr in a){//对象赋值,这是一个浅拷贝,如果属性是一个对象则2个对象的属性会引用同一个对象。
b[attr] = a[attr];
}
b.name = 'hi';
alert( a.name ); //hello
*/ var a = {
name : { age : 100 }//a对象的name属性是一个对象
};
var str = JSON.stringify(a);//变成一个字符串,'{"name":{"age":100}}'
var b = JSON.parse(str);//b就是一个对象了。
alert("sss");//sss
alert(str);//{"name":{"age":100}}
alert(b);//[object Object]
b.name.age = 200;
alert( a.name.age );//100 </script>
</head> <body>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script> window.onload = function(){
var oDiv = document.getElementById('div1');
alert( oDiv.dataset.miaov );
alert( oDiv.dataset.miaovAll );//miaov-all要写成miaovAll,
}; </script>
</head> <body>
<div id="div1" data-miaov="妙味" data-miaov-all="妙味课堂">div</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script> </head> <body>//jquery.mobile表示手机的jquery
<div data-role="page" id="div1">
<div data-theme="c" data-role="header">
<h3>妙味课堂</h3>
</div>
<div data-role="context">
<a href="#div2" data-transition="slide">点击</a>
</div>
</div> <div data-role="page" id="div2">
<div data-theme="b" data-role="header">
<h3>妙味课堂-移动开发教程</h3>
</div>
<div data-role="context">
<a href="#div1" data-transition="slide" data-direction="reverse">点击</a>
</div>
</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title> //单线程从上到下加载
<script src="a.js" defer="defer"></script> //延迟在页面加载完后加载
<script src="b.js" defer="defer"></script>
<script src="c.js" defer="defer"></script> <script src="a.js" async ="async"></script> //异步加载,开线程和页面一起加载,有可能页面没有加载完就执行js会出现元素找不到。这种方式可以加载相对独立的js保证不出现元素找不到。
<script src="b.js" async ="async"></script>
<script src="c.js" async ="async"></script>
</head> <body>
<img src=""> </body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script> //触发历史管理 : 1.通过跳转页面 2.hash 3.pushState </script>
</head> <body>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
window.onload = function(){
var oInput = document.getElementById('input1');
var oDiv = document.getElementById('div1');
var json = {};
oInput.onclick = function(){
var num = Math.random();
var arr = randomNum(35,7);
json[num] = arr;
oDiv.innerHTML = arr;
window.location.hash = num;
}; window.onhashchange = function(){ //浏览器的onhashchange事件。
oDiv.innerHTML = json[window.location.hash.substring(1)];
}; function randomNum(iAll,iNow){
var arr = [];
var newArr = [];
for(var i=1;i<=iAll;i++){
arr.push(i);
}
for(var i=0;i<iNow;i++){
newArr.push( arr.splice( Math.floor(Math.random()*arr.length) ,1) );
}
return newArr; } };
</script>
</head> <body>
<input type="button" value="随机选择" id="input1">
<div id="div1"></div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>//浏览器的回退,回退历史管理。
window.onload = function(){
var oInput = document.getElementById('input1');
var oDiv = document.getElementById('div1');
oInput.onclick = function(){
var arr = randomNum(35,7);
history.pushState(arr,'',arr);//放到浏览器回退站中
oDiv.innerHTML = arr;
};
window.onpopstate = function(ev){//回退时浏览器自动从回退栈中取
oDiv.innerHTML = ev.state;
};
function randomNum(iAll,iNow){
var arr = [];
var newArr = [];
for(var i=1;i<=iAll;i++){
arr.push(i);
}
for(var i=0;i<iNow;i++){
newArr.push( arr.splice( Math.floor(Math.random()*arr.length) ,1) );
}
return newArr;
}
};
</script>
</head> <body>
<input type="button" value="随机选择" id="input1">
<div id="div1"></div>
</body>
</html>

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