Question

我有以下trial.html Code.It有<select>标记。 PS：它没有重复，因为它没有使用Ajax，我不熟悉Ajax，并且有像我这样的人。

<!DOCTYPE html>
<html>
<head>
  <title>Popup</title>
  <script type="text/javascript" src="jquery.min.js"></script>
  <script src="trial.js"></script>
</head>
<body>
  <h1></h1>
  <div role="main">
    <form >
      <label for="timeframe">Remove all browsing data from:</label>

      <select id="timeframe" name="timeframe">
        <option value="Null">Please Select one</option>
        <option  value="hour">the past hour</option>
        <option value="day">the past day</option>
        <option value="week">the past week</option>
        <option value="4weeks">the past four weeks</option>
        <option value="forever">the beginning of time</option>
      </select>

      <input type="submit" id="submit" value="submit">
    </form>
  </div>
</body>
</html>

这是trial.js

   $(document).ready(
function(){
var selected;
  $("#timeframe").change(

function(){
selected=$("#timeframe option:selected").val();
})
///Figure out how to use selected outside.
//function that gives time taking the selecte as input
 parseMilliseconds= function (timeframe) {
    var now = new Date().getTime();
    var milliseconds = {
      'hour': 60 * 60 * 1000,
      'day': 24 * 60 * 60 * 1000,
      'week': 7 * 24 * 60 * 60 * 1000,
      '4weeks': 4 * 7 * 24 * 60 * 60 * 1000
    };

    if (milliseconds[timeframe])
      return now - milliseconds[timeframe];

    if (timeframe === 'forever')
      return 0;

    return null;
  },




if(selected!=undefined){
//that deletes history
 chrome.browsingData.remove(
{ "since" : parseMilliseconds(selected) }, {
        "appcache": true,
        "cache": true,
        "cookies": true,
        "downloads": true,
        "fileSystems": true,
        "formData": true,
        "history": true,
        "indexedDB": true,
        "localStorage": true,
        "serverBoundCertificates": true,
        "pluginData": true,
        "passwords": true,
        "webSQL": true
      }


  , function callback(){
 alert("Data Deleted");

  })

}



}
)

所以我想在change事件上使用在回调函数之外选择的变量。我该怎么做？

如何在全局范围外使用回调函数的变量（它不使用ajax）？

0 个答案: