大约有 44,000 项符合查询结果（耗时：0.0457秒） [XML]
The remote end hung up unexpectedly while git cloning
...
1
2
Next
489
...
Can you have if-then-else logic in SQL? [duplicate]
...
106
You can make the following sql query
IF ((SELECT COUNT(*) FROM table1 WHERE project = 1) >...
Why can't I use a list as a dict key in python?
...
11 Answers
11
Active
...
getting the screen density programmatically in android?
...
19 Answers
19
Active
...
jQuery map vs. each
...ion you can potentially waste a lot of memory.
For example:
var items = [1,2,3,4];
$.each(items, function() {
alert('this is ' + this);
});
var newItems = $.map(items, function(i) {
return i + 1;
});
// newItems is [2,3,4,5]
You can also use the map function to remove an item from an array...
How do you match only valid roman numerals with a regular expression?
...
16 Answers
16
Active
...
How to use Active Support core extensions
I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7.
5 Answers
5
...
How to create custom easing function with Core Animation?
...
// this should be a function that takes a time value between
// 0.0 and 1.0 (where 0.0 is the beginning of the animation
// and 1.0 is the end) and returns a scale factor where 0.0
// would produce the starting value and 1.0 would produce the
// ending value
typedef double (^KeyframeParametric...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...命令可以登录主节点使用
db.adminCommand({replSetStepDown : 1})
如果杀不掉可以使用强制开关
db.adminCommand({replSetStepDown : 1, force : true})
或者使用 rs.stepDown(120)也可以达到同样的效果，中间的数字指不能在停止服务这段时间成...
Best way to merge two maps and sum the values of same key?
...
15 Answers
15
Active
...