构旨在检查变量的值是否

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如果不满足条件则跳过语句并执行语句。我们使用构造扩展脚本并将比较运算符较小替换为相等这次构造返回结果。变量的值不等于变量的值。不满足条件。这意味着执行的不是下列出的语句而是下定义的语句。应用程序中的语言构造如果条件不满足则执行下定义的语句。注意如果代码片段的执行与两个值的相等性相关则在中使用双等号。为变量赋值时仅使用简单的等号。表达式中的条件通过前面的感叹号来否定。

该示例显示了条件  丹麦电报号码数据 及其否定对应于和的一个实际应用是基于表单的密码查询。我们使用文件和再次模拟这些。打开并粘贴以下表单代码该结构对应于已创建的表单。然而这一次一个输入字段对我们来说就足够了密码查询。和以前一样用户输入被传递到脚本。我们使用以下代码对此进行调整以便将密码条目与存储的密码进行比较代码如下首先我们为第行的变量分配一个值我们通过方法检索该值。



然后我们定义以下控制结构第行中的结与字符串匹配。如果是这种情况则会输出字符串密码正确。如果返回结果则在第行使用并输出字符串。现在我们通过调用脚本。用于密码查询的表单的界面表单要求您输入密码。浏览器向我们展示了用于密码查询的表单的视图。我们按照请求输入脚本中定义的密码并单击发送按钮。密码查询正确该脚本确认输入的密码正确。浏览器自动将我们重定向到。

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