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根据w3 XHTML规范label属性为选项指定了较短的标签。 但是(使用FF3.5 的try-it工具 ),我看不到任何效果。 因此我的问题是:这个属性真正起作用了什么?

编辑它似乎覆盖了下拉列表中使用的标签。 该选项的内容(据我所知)仅用作value的默认value 。 这(在IE7 +中)是否使以下两个声明等效?

<option label="Volvo">Volvo (Latin for 'I roll')</option>

<option label="Volvo" value="Volvo (Latin for 'I roll')">Whatever....</option>

According to the w3 XHTML specification, the label attribute specifies a shorter label for the option. However (using the try-it tool with FF3.5), I can't see any effect. Hence my question: what does this attribute really do?

EDIT It seems that it overrides the label used in the dropdown list. The contents of the option are (as far as I know) only used as the default for the value. Does this (in IE7+) make the following two declarations equivalent?

<option label="Volvo">Volvo (Latin for 'I roll')</option>

and

<option label="Volvo" value="Volvo (Latin for 'I roll')">Whatever....</option>

原文:https://stackoverflow.com/questions/2154824
更新时间:2023-11-09 11:11

最满意答案

使用方法startActivity(Intent)以意图启动您的活动B.

你的意图应该使用参数A.this和B.class创建,导致代码看起来像这样:

意图i =新意图(A.this,B.class);

A.this.startActivity(ⅰ);


Start your activity B with an intent, using the method startActivity(Intent).

Your intent should be created with the arguments A.this and B.class, resulting in code looking somewhat like this:

Intent i = new Intent(A.this, B.class);

A.this.startActivity(i);

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