localStorage eventHandler不会被调用 [英] localStorage eventHandler Doesn't Get Called
问题描述
这是我的代码:
<script type="text/javascript">
function getLocalStorage() {
try {
if (!! window.localStorage) return window.localStorage;
} catch(e) {
return undefined;
}
}
function getAddEventListener() {
try {
if( !! window.addEventListener ) return window.addEventListener;
} catch(e) {
return undefined;
}
}
function eventHandler(e) {
alert("here we are = " + e.storageArea.traveler);
}
function testStorage() {
var db = getLocalStorage();
var addEL = getAddEventListener();
if(addEL) {
addEL('storage', eventHandler, false);
} else {
alert('This browser does not support event listeners');
}
db.setItem('traveler', 'Bill');
db.setItem('destination', 'Ventura');
db.setItem('transportation', 'Airplane');
document.getElementById('results').innerHTML = db.getItem('destination');
}
</script>
</head>
<body onload="testStorage();">
<div id="results"> </div>
</body>
</html>
它成功地将项目插入本地存储，并以'results'元素显示结果，但是eventHandler不起作用.我刷新了浏览器窗口，但是没有看到任何警报消息.为什么?
It successfully insert items in the local storage and display result in 'results'-element, but eventHandler doesn't work. I refresh the browser windows and don't see any alert messages. Why?
推荐答案
因为存储事件不适用于同一窗口/选项卡.仅针对使用相同 localStorage 的其他窗口/选项卡触发它们.尝试打开两个分离选项卡，然后在其中之一中向 localStorage 中插入一些数据.
Because storage events don't work for same window/tab. They are fired only for other windows/tabs that use same localStorage. Try opening two separat tabs and in one insert some data to the localStorage.
这是一个类似的问题，说明了 localStorage >活动有效.
Here is a similar question that explains how localStorage event works.
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