大约有 35,433 项符合查询结果（耗时：0.0480秒） [XML]
setTimeout / clearTimeout problems
I try to make a page to go to the startpage after eg. 10sec of inactivity (user not clicking anywhere). I use jQuery for the rest but the set/clear in my test function are pure javascript.
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postgresql COUNT(DISTINCT …) very slow
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40
holy queries batman! This sped up my postgres count distinct from 190s to 4.5 whoa!
– rogerdpack
Nov ...
How can I generate random alphanumeric strings?
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1750
I heard LINQ is the new black, so here's my attempt using LINQ:
private static Random random = ...
How can I make a div stick to the top of the screen once it's been scrolled to?
...ositioning your element as fixed:
.fixedElement {
background-color: #c0c0c0;
position:fixed;
top:0;
width:100%;
z-index:100;
}
Edit: You should have the element with position absolute, once the scroll offset has reached the element, it should be changed to fixed, and the top p...
How can I get jquery .val() AFTER keypress event?
... Simon Arnold
13.8k66 gold badges5959 silver badges8080 bronze badges
answered Jun 17 '10 at 16:11
Hooray Im HelpingHooray Im Helping
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Flexbox not giving equal width to elements
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If you want your elements to be completely even, you can set flex-basis: 0. This will set the flex basis to 0 and then any remaining space (which will be all space since all basises are 0) will be proportionally distributed based on flex-grow.
li {
flex-grow: 1;
flex-basis: 0;
/* ......
What is an intuitive explanation of the Expectation Maximization technique? [closed]
... parameters:
import numpy as np
from scipy import stats
np.random.seed(110) # for reproducible results
# set parameters
red_mean = 3
red_std = 0.8
blue_mean = 7
blue_std = 2
# draw 20 samples from normal distributions with red/blue parameters
red = np.random.normal(red_mean, red_std, size=20)
b...
What is the largest TCP/IP network port number allowable for IPv4?
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answered Sep 22 '08 at 4:53
Greg HewgillGreg Hewgill
783k167167 gold badges10841084 silver badges12221222 bronze badges
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Getting the closest string match
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+100
I was presented with this problem about a year ago when it came to looking up user entered information about a oil rig in a database ...
Using sed and grep/egrep to search and replace
I am using egrep -R followed by a regular expression containing about 10 unions, so like:
.jpg | .png | .gif etc. This works well, now I would like to replace all strings found with .bmp
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