大约有 30,000 项符合查询结果（耗时：0.0571秒） [XML]
What is the equivalent of “!=” in Excel VBA?
...
Just a note. If you want to compare a string with "" ,in your case, use
If LEN(str) > 0 Then
or even just
If LEN(str) Then
instead.
share
|
improve ...
Does a const reference class member prolong the life of a temporary?
...Here's the simplest way to explain what happened:
In main() you created a string and passed it into the constructor. This string instance only existed within the constructor. Inside the constructor, you assigned member to point directly to this instance. When when scope left the constructor, the st...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...不同的类型的数组，比如：
1
arr = {"string", 100, "haoel", function() print("coolshell.cn") end}
注：其中的函数可以这样调用：arr[4]()。
我们可以看到Lua的下标不是从0开始的，是从1开始的。
1
...
How to handle checkboxes in ASP.NET MVC forms?
... foreach (Guid guid in selectedObjects) {
Response.Write(guid.ToString());
}
Response.End();
return (new EmptyResult());
}
This example will just write the GUIDs of the boxes you checked; ASP.NET MVC maps the GUID values of the selected checkboxes into the Guid[] selectedObj...
jQuery AJAX submit form
...
It's serialized into a query string, just like the data you are putting into the array manually in the GET call there would be. This is what you want, I'm pretty sure.
– JAL
Dec 25 '09 at 1:50
...
Refresh a page using JavaScript or HTML [duplicate]
... javascript to the page that always get the versionnumber of the page as a string (ajax) at loading. for example: www.yoursite.com/page/about?getVer=1&__[date]
Compare it to the stored versionnumber (stored in cookie or localStorage) if user has visited the page once, otherwise store it directly...
Determine if an element has a CSS class with jQuery
...e);
or
$(selector).hasClass(className);
The argument is (obviously) a string representing the class you are checking, and it returns a boolean (so it doesn't support chaining like most jQuery methods).
Note: If you pass a className argument that contains whitespace, it will be matched literall...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...
Recommended: Declare your variables, for example when you try to append a string to an undefined variable. Or use isset() / !empty() to check if they are declared before referencing them, as in:
//Initializing variable
$value = ""; //Initialization value; Examples
//"" When you want ...
String concatenation in MySQL
...ame FROM test.student
As @eggyal pointed out in comments, you can enable string concatenation with the || operator in MySQL by setting the PIPES_AS_CONCAT SQL mode.
share
|
improve this answer
...
javax.faces.application.ViewExpiredException: View could not be restored
...tton value="Logout" action="logout?faces-redirect=true" />
or
public String logout() {
// ...
return "index?faces-redirect=true";
}
To instruct the browser to not cache the dynamic JSF pages, create a Filter which is mapped on the servlet name of the FacesServlet and adds the needed ...