javascript 从 localStorage 读取和写入？
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Reading and writing from localStorage?
提问by Sami
I just started to study Phonegap + jQuery Mobile and HTML5,, so don't loose your nerve with my idiocy!
我刚开始学习Phonegap + jQuery Mobile 和HTML5，所以不要因为我的愚蠢而放松你的神经！
Could somebody tell me why this is not working? When I am using a variable from localStorage, I just get an empty screen when pressing the button, but when using a variable temperature="100", it is working fine. Android 4.1.
有人能告诉我为什么这不起作用吗？当我使用来自 localStorage 的变量时，按下按钮时我只会得到一个空屏幕，但是当使用变量温度 =“100”时，它工作正常。安卓 4.1。
<script type="text/javascript" charset="utf-8">
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
window.localStorage.setItem("temperature", "100");
var temperature = window.localStorage.getItem("temperature");
}
</script>
<div data-role="content">
<p>Working or not?</p>
<button onclick="myFunction()">Try it</button>
<p id="testi"></p>
<script type="text/javascript">
function myFunction() {
//var temperature = "100";----> This is working!
document.getElementById("testi").innerHTML = temperature;
}
</script>
</div>
Another question: How to handle variables between pages in Windows Phone? They are not supporting localStorage, so is there another way to handle this if you haven't got db-connection?
另一个问题：如何在Windows Phone中处理页面之间的变量？他们不支持 localStorage，所以如果您没有 db-connection，还有其他方法可以解决这个问题吗？
Thanks!
谢谢！
Sami
萨米人
回答by brymck
temperatureis local to the scope of the onDeviceReadyfunction. That is, once the function is over, it's gone.
temperature是onDeviceReady函数作用域的局部。也就是说，一旦功能结束，它就消失了。
You have two options:
您有两个选择：
// Make it global
var temperature;
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
window.localStorage.setItem("temperature", "100");
temperature = window.localStorage.getItem("temperature");
}
or:
或者：
// Retrieve it in myFunction
function myFunction() {
var temperature = localStorage.getItem("temperature");
document.getElementById("testi").innerHTML = temperature;
}
For a good list of examples of function scope, try this answer.
有关功能范围示例的良好列表，请尝试此答案。
