阅读和写作的localStorage？ [英] Reading and writing from localStorage?

问题描述

我刚开始研究的PhoneGap + jQuery Mobile的和HTML5 ,,所以不要用我的白痴失去你的神经！

I just started to study Phonegap + jQuery Mobile and HTML5,, so don't loose your nerve with my idiocy!

有人能告诉我这是为什么不工作？当我使用从localStorage的一个变量，我就当pressing按钮，但使用的是变温=100，当得到一个空的屏幕，这是工作的罚款。搭载Android 4.1。

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.

<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>

另外一个问题：如何处理页面之间的变量的Windows Phone？他们不支持本地存储，所以有另一种方式来处理这个，如果你还没有得到DB连接？

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?

谢谢！

萨米

推荐答案

温度是本地的范围 onDeviceReady 功能。也就是说，一旦功能结束，就不见了。

temperature is local to the scope of the onDeviceReady function. That is, once the function is over, it's gone.

您有两种选择：

// Make it global
var temperature;
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
  window.localStorage.setItem("temperature", "100");
  temperature = window.localStorage.getItem("temperature");
}

或

// Retrieve it in myFunction
function myFunction() {
  var temperature = localStorage.getItem("temperature");
  document.getElementById("testi").innerHTML = temperature;
}

有关的功能范围的例子一个很好的列表，请尝试这个答案。

For a good list of examples of function scope, try this answer.

这篇关于阅读和写作的localStorage？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！