一、功能
1、前台页面:访问地址index.html?rid=参数id,点击点播
2、后台管理员管理页面实时收到点播信息
简单页面:
前台页面index.html
后台页面new.html
二、实现
跨页面通信可以用localstorage实现。
1、关于localstorage
(1)写入,localStorage只支持string类型的存储
function play(){
if(!window.localStorage){
alert("浏览器不支持localstorage");
return false;
}else{
//主逻辑业务
localStorage.clear();
//写入的几种形式
localStorage.rid = '1';
//localStorage['rid']=1;
//localStorage.setItem('rid',1);
}
}
可以用谷歌自带的插件查看:
查看localStorage写入情况
(2)读取
if(!window.localStorage){
alert("浏览器不支持localstorage");
}else{
alert(localStorage.rid);
//alert(localStorage['rid']);
//alert(localStorage.getItem('rid'));
}
(3)storage事件监听(要在服务器下运行)
window.addEventListener("storage", function (e) {
alert(e.newValue);
});
2、放效果图
效果图3、最终实现代码
<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
这里是一部电影的简介
<button id="play">点播</button>
</body>
<script type="text/javascript">
//读取当前url参数
function getQueryString(name){
var reg=new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
var r=window.location.search.substr(1).match(reg);
if(r!=null)return unescape(r[2]); return null;
}
// 探测浏览器是否支持localStorage
var isSupportLocalStorage = function() {
try {
return 'localStorage' in window && window['localStorage'] != null;
} catch (e) {
return false;
}
};
var addEvent = (function() {
if(document.addEventListener) {
return function(el, type, fn) {
if(el && el.nodeName || el === window) {
el.addEventListener(type, fn, false);
} else if (el && el.length) {
for(var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
} else {
return function(el, type, fn) {
if(el && el.nodeName || el === window) {
el.attachEvent('on' + type, function() {
return fn.call(el, window.event);
});
} else if (el && el.length) {
for(var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
}
})();
var play=document.getElementById('play');
if(isSupportLocalStorage()) {
// 清除所有存储的key,value值
localStorage.clear();
var playBtn = document.getElementById('play');
addEvent(playBtn, 'click', function () {
// 按下按钮存下当前输入框中的值
localStorage.setItem('rid', getQueryString('rid'));
});
// 存储数字
//localStorage.setItem('number', 1);
// 存储对象 因为localStorage最终都是以String来存储的 所以如果要存储对象 可以覆写它的toString方法
// 按照你想要的字符串格式来存储, 然后取出后再做相应的处理, 这里就拿json格式做个例子
//localStorage.setItem('obj', "{'name':'Andrew', 'job': 'Developer'}");
// 常规的存储
//localStorage.setItem('string', 'hello world');
} else {
// 这里可以做些降级的方案, 当然也可以给出一个不支持的提示
var span = document.createElement("span");
span.style.color = 'red';
span.innerHTML = 'oops, your browser dones\'t support localStorage yet. :(';
document.getElementsByTagName('body')[0].appendChild(span);
}
</script>
</html>
<!-- new.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>这是新的页面</title>
</head>
<body>
<p id="p"></p>
<table border="1px">
<tr>
<td>房间号</td>
<td>消息</td>
</tr>
<tr id="101">
<td name="rid">101</td>
<td name="msg">暂无</td>
</tr>
<tr id="102">
<td name="rid">102</td>
<td name="msg">暂无</td>
</tr>
<tr id="103">
<td name="rid">103</td>
<td name="msg">暂无</td>
</tr>
</table>
</body>
<script type="text/javascript">
// 探测浏览器是否支持localStorage
var isSupportLocalStorage = function() {
try {
return 'localStorage' in window && window['localStorage'] != null;
} catch (e) {
return false;
}
};
var addEvent = (function() {
if(document.addEventListener) {
return function(el, type, fn) {
if(el && el.nodeName || el === window) {
el.addEventListener(type, fn, false);
} else if (el && el.length) {
for(var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
} else {
return function(el, type, fn) {
if(el && el.nodeName || el === window) {
el.attachEvent('on' + type, function() {
return fn.call(el, window.event);
});
} else if (el && el.length) {
for(var i = 0; i < el.length; i++) {
addEvent(el[i], type, fn);
}
}
};
}
})();
if(isSupportLocalStorage()) {
// 给window监听storage事件
addEvent(window, 'storage', function (event) {
// 查看event对象内容
// console.dir(event);
// 可以输出oldValue和newValue观察
changeMsg(event.newValue);
console.log('key: %s, old value: %s, new value: %s', event.key, event.oldValue, event.newValue);
});
// 取出来也是String类型的, 要用parseInt转换下
//console.log(parseInt(localStorage.getItem('number')));
// 取出来的json格式字符串要用eval解析一下 转换成对象
//console.dir(eval('(' + localStorage.getItem('obj') + ")"));
// 普通的读取
//console.log(localStorage.getItem('string'));
} else {
var span = document.createElement("span");
span.style.color = 'red';
span.innerHTML = 'oops, your browser dones\'t support localStorage yet. :(';
document.getElementsByTagName('body')[0].appendChild(span);
}
function changeMsg(rid){
var obj=document.getElementById(rid);
obj.cells[1].innerHTML='有人点播了哦';
}
</script>
</html>
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