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the road long its repair far XI, I will go up and down and quest!JS Object-oriented and profound, deep inside, will not go and unfavorable, eventually into a generation guru.Appetizer DishesDoes the duplicate declaration of a variable have an effect?var a = {};var A;AA little inspiration?Array Object functions[] {} function X () {}New Array () New Object () New X ()Small problem in front(1) function does not specify a return value, what is returned by default? Undefined(2) JS has a block scope?

JavaScript jQuery usage and reference order Reference Order:first lead the CSS and then lead JSJS in the first cited jQuery, and then cited jabascript, and then lead their own JSUsage:JQuery needs to introduce a js file, and before all the js Code1. Find the Label:JS : document.getelement .... contains all the search codes Dom ObjectJQuery :$ ( selector ); selector contains ID Selector,class selector jQuery Objectthe following two sentences represent finding a label with ID AA and adding a c

Nested list example: [[' AA ', ' BB ', ' 2 "," NN "],[" AA "," BB "," a "," NN "],[" AA "," BB "," a "," NN "],[" AA "," BB "," a "," NN "],[" AA ", "BB", "],[", "nn", "AA", "BB", "I", "nn"] we want to sort the third field of th

, a host to communicate directly with another host, you must know the target host's MAC address. But how does this target MAC address get? It is obtained through the Address Resolution Protocol. "Address Resolution" is the process by which a host converts a target IP address to a target MAC address before sending a frame. The basic function of ARP protocol is to inquire the MAC address of target device through the IP address of target device, so as to ensure the smooth communication. Each compu

elements are in a, not in B, and vice versa.Set Set "B" AA BB -- ------ -------- 1 3 24 3 5 4 6Left OUTER JOINNow execute the following SQL statement (left connection, OUTER join):SELECT * from Left OUTER JOIN on = BbYou will get the following result (blank element representation NULL ):AA BB -- ------ -------- 1 2 3 3) 4 4Left join (left OUTER JOIN) outputs all the results from the table on the right

= = ' Sortarrow ') { if (GetParent (Allspans[ci], "table") = = GetParent (lnk, "table")) {//In the same table as us? allspans[ci].innerhtml = '; } } } span.innerhtml = ARROW; } function GetParent (el, Ptagname) { if (el = = null) return null; else if (El.nodetype = = 1 el.tagName.toLowerCase () = = Ptagname.tolowercase ())//Gecko bug, supposed to is U Ppercase Return el; Else Return GetParent (El.parentnode, ptagname); } function Ts_sort_date (a,b) { Y2K Notes:two digit yea

();Span.setattribute (' Sortdir ', ' up ');} else {ARROW = ' ↓ ';Span.setattribute (' Sortdir ', ' down ');}We appendchild rows that already exist to the tbody, so it moves them rather than creating new onesDon ' t do sortbottom rowsfor (i=0;iDo sortbottom rowsfor (i=0;iDelete any other arrows there may showingvar Allspans = document.getElementsByTagName ("span");for (Var ci=0;ciif (Allspans[ci].classname = = ' Sortarrow ') {if (GetParent (Allspans[ci], "table") = = GetParent (lnk, "table")) {/

Tags: search articleTo learn index classifications and create indexes:1._ID Index The default index for most collections2. Single key index: Manually created, a single value3. Multi-built Index: composite function4. Composite index: The leftmost prefix principle5. Expired index: Expire within a certain time, note: must be isodate or its array, do not use timestamp, otherwise it will not be automatically deleted.6. Full-text index Db.tm.ensureindex ({"article": "Text"}), Db.tm.ensureindex ({"Key1

') --------------------------------------------------------------------- -323 -- It can also be a negative number. SQL> c/1999-01-12/2999-10-12 1 * select to_date ('2017-10-12 ', 'yyyy-mm-dd')-to_date ('2017-12-01', 'yyyy-mm-dd') from dual SQL>/ TO_DATE ('2017-10-12 ', 'yyyy-MM-DD')-TO_DATE ('2017-12-01 ', 'yyyy-MM-DD ') --------------------------------------------------------------------- 365193 Next let's take a look at how TO use interval year to month. SQL> create table

A question about DISTINCT. Some people often ask questions similar to this. The data in the table is as follows: idaabb201734561453554160656416065625066426063898920.00002. expected results are that some people often ask questions similar to this, The data in the table is as follows: ID AA BB 1 123 456 1 4535 54 1 60 6564 1 60 656 2 50 664 2 60 6 3 89 4 40 4242 The expected result is: ID AA BB 1 123 456 2 50

Serialization should be no stranger to everyone, especially now that there is a lot of webapi,json flying around, and serialization operations should often appear on our code.And our most commonly used serialization tool should be Newtonsoft.json, of course you use other tool classes is also no problem, we focus on not this tool, we focus on efficient and customizable control of the serialization operations.First, let's talk about the approximate serialization principle:In general, we pass an en

This article mainly introduces the problem of errors reported by reference in php5.4, and analyzes the problem and solution of errors reported by reference in php5.4 based on the instance form, which has some reference value, if you need it, you can refer to the example in this article to analyze the error message returned when you reference php5.4. We will share this with you for your reference. The details are as follows: There is no problem in transferring references from php5.3 series and e

X5 and X6 and X7; 148, stock price limit. Draw yellow on the candlestick chartStickline (C/ref (c,1) >=1.099,o,c,1,0), Coloryellow; 149, this close for the lowest closing price in n days (%)　　(C-LLV (C,n))/llv (c,n) *100; 150, this close for the highest closing price in n days (%)　　(HHV (C,n)-c)/HHV (c,n) *100;　　 151, the relative position of the stock price in the last n days of running space　　(C-LLV (L,n))/(HHV (h,n)-llv (l,n)) *100;　　 152, n1% to n2% at the top of the stock price (%)　　Aa:=

The problem of string processing into an array: $ str quot; aa: 1, bb: 2, cc: 3, dd: 4 quot; has two requirements: 1. I want to split this string into an array, where aa, bb, cc, and dd are indexes 11, 22, and 33, and 44 are the index values, for example, $ arrArray ([aa] gt; 11, [bb] gt; 22, [cc] gt string processing into an array A string is as follows: $

In this paper, the author analyzes the php5.4 of quoted times. Share to everyone for your reference, as follows: php5.3 Series version and previous version, reference no problem, after upgrading to php5.4, the place of reference, full error Fatal error:call-time pass-by-reference have been removed in F:\work\wamp\www\test\test.php on line 6. take a look at the following example. Example 1, recursive reference, PHP 5.3 and version, test results "; $BB