Question

我得到了这个

$('#password').change(function() {
    var toSha1 = $('#msisdn').val() + $('#password').val();
    var authCode = $.sha1(toSha1);
});

如何使变量authCode在整个脚本中可见。例如，这可以正常工作：

  $('#password').change(function() {
    var toSha1 = $('#msisdn').val() + $('#password').val();
    var authCode = $.sha1(toSha1);
});
 alert(authCode);

我尝试过没有关键字“var”来定义它，但似乎没有用。

编辑：这是来源

<div data-role="content">
    <textarea id='resultArea'></textarea>
    <label for='msisdn'>MSISDN:</label>
    <input type='text' id='msisdn' value='+359899888777'>
    <label for='authCode'>authCode:</label>
    <input type='text' id='authCode' value='8bcac5dabf06219843a5a3b755c47e69600e050a'>
    <label for='password'>Password:</label>
    <input type='password' id='password' value='123'>
    <button data-role='button' data-inline='true' data-theme='e' id='register'>Register</button>
    <button data-role='button' data-inline='true' data-theme='e' id='login'>Login</button>
</div><!-- /content -->
<script>
$('#resultArea').hide();
$('#password').change(function() {
    var toSha1 = $('#msisdn').val() + $('#password').val();
    window.authCode = $.sha1(toSha1);
});
alert(window.authCode);
</script>

Answer 1

明确地将其变为全球：

window.authCode = $.sha1(toSha1);

全局变量是window对象的属性。

请注意，您的代码存在单独的问题：您在连接处理程序后立即警告authCode的值，而不是在change事件触发时。见评论：

$('#resultArea').hide();               // Happens immediately
$('#password').change(function() {     // change() call happens immediately, setting up the handler
    // ...but this code runs when the handler is *called*, not inline with the code above and below
    var toSha1 = $('#msisdn').val() + $('#password').val();
    window.authCode = $.sha1(toSha1);
});
alert(window.authCode);                // Happens immediately after the calls above

Answer 2

更改：

var authCode = $.sha1(toSha1);

以

window.authCode = $.sha1(toSha1);

使javascript变量在整个脚本中可见

2 个答案: