大约有 42,000 项符合查询结果（耗时：0.0336秒） [XML]
How can I write text on a HTML5 canvas element?
...
var canvas = document.getElementById("my-canvas");
var context = canvas.getContext("2d");
context.fillStyle = "blue";
context.font = "bold 16px Arial";
context.fillText("Zibri", (canvas.width / 2) - 17, (canvas.height / 2) + 8);
#my-canvas {
backgro...
What's the best way to set a single pixel in an HTML5 canvas?
...e a 1×1 image data, set the color, and putImageData at the location:
var id = myContext.createImageData(1,1); // only do this once per page
var d = id.data; // only do this once per page
d[0] = r;
d[1] = g;
d[2] = b;
d[3] = a;
myContext.putImageData( id, x, y ); ...
Best way to store date/time in mongodb
...SODate()})
> db.test.insert({date: new Date()})
> db.test.find()
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:42.389Z") }
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:57.240Z") }
The native type supports a whole range of useful methods out of the box, which ...
LEFT OUTER joins in Rails 3
...
@posts = Post.joins("LEFT OUTER JOIN users ON users.id = posts.user_id").
joins(:blog).select
share
|
improve this answer
|
follow
...
Best way to center a on a page vertically and horizontally? [duplicate]
...t work in IE7).
This trick will work with any sizes of div.
div {
width: 100px;
height: 100px;
background-color: red;
position: absolute;
top:0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
<div></div>
...
How can I change an element's text without changing its child elements?
... to be the first thing in the element, then given e.g. this HTML:
<div id="your_div">
**text to change**
<p>
text that should not change
</p>
<p>
text that should not change
</p>
</div>
You could do this:
var your_div = document.ge...
How do I auto-submit an upload form when a file is selected?
...mit method in the onchange event of your file input.
document.getElementById("file").onchange = function() {
document.getElementById("form").submit();
};
http://jsfiddle.net/cwvc4/73/
share
|
...
View's SELECT contains a subquery in the FROM clause
...
create view view_clients_credit_usage as
select client_id, sum(credits_used) as credits_used
from credit_usage
group by client_id
create view view_credit_status as
select
credit_orders.client_id,
sum(credit_orders.number_of_credits) as purchased,...
How to replace captured groups only?
...ing and following text:
str.replace(/(.*name="\w+)(\d+)(\w+".*)/, "$1!NEW_ID!$3")
share
|
improve this answer
|
follow
|
...
Simple way to transpose columns and rows in SQL?
...r, Eric value, 'Eric' name
from yourTable
) src
group by name
See SQL Fiddle with Demo
The UNION ALL performs the UNPIVOT of the data by transforming the columns Paul, John, Tim, Eric into separate rows. Then you apply the aggregate function sum() with the case statement to get the new columns ...