new date gettime

Gets the time in milliseconds when the System.currenttimemillis () method is more efficient than the new date (). GetTime () Because of the new date (). GetTime () method call System.currenttimemillis ()The System.currenttimemillis () that is called

Public static void main (String[] args)  {    ArrayList  l = new ArrayList<> (7500001);    long start=  System.currenttimemillis ();     for (int i =0 ; i  Results: New date cost [1842] mssystem.currenttimemillis cost [391] ms New Date (). GetTime ()

Original: http://www.cssrain.cn /? P = 305 (1) gettime (new date. gettime method) Returns the number of milliseconds of the specified date object since midnight, January 1, January 1, 1970. This method is used to compare two or more date objects.

Js optimization works for IE6.0, which summarizes the following points: I. String concatenation: concatenate strings with ArraysCopy codeThe Code is as follows:Function func2 (){Var start = new Date (). getTime ();Var array = [];For (var I = 0; I

JS optimization for IE6.0 function, summed up a few: One, string concatenation: Using array stitching Copy Code code as follows: function Func2 () { var start = new Date (). GetTime (); var array = []; for (var i = 0; i Array[i]

The execution efficiency of JS code often directly affects the performance of the page, sometimes, to achieve the same function, different JS code often in the efficiency of a lot of differences, and sometimes just because of our writing habits

Comments: Arrays in Javascript are powerful guys: You can dynamically change the length without specifying the length when creating it. You can read it as a normal array or use it as a stack. You can change the value or even type of each element in

[From] http://www.jb51.net/article/89767.htmThere are many ways to get timestamps in Nodejs, such as:1.new Date (). GetTime ()2.Date.now ()3.process.uptime ()4.process.hrtime ()Usually want to get a time stamp, with these methods can be, then what

Package Com.*;import Java.awt.borderlayout;import Java.awt.toolkit;import java.awt.event.mouseevent;import Java.awt.event.mouselistener;import Java.io.file;import Java.util.date;import Javax.swing.ImageIcon;import Javax.swing.jframe;import

Reference: http://www.php100.com/html/webkaifa/javascript/2012/0619/10568.htmlHttp://www.chinaz.com/web/2011/1130/223585.shtmlHttp://www.jb51.net/article/29718.htm1 Put the unwanted JS at the end of the body when loading2 Merging multiple JS codes3

1, the creation of the array The code is as follows Copy Code var arrayobj = new Array (); Create an arrayvar arrayobj = new Array ([size]); Create an array and specify the length, note not the upper limit, is the

Array de-duplication is a common requirement, we temporarily consider the same type of array to repeat. It is mainly to clarify the thinking and consider the performance. The following methods, basic online, here is simply a summary.Ideas:

Generally we all know the general difference between ArrayList and LinkedList: 1.ArrayList is a data structure based on dynamic array, LinkedList based on the data structure of the linked list. 2. For random access get and set,arraylist feel better

There are several headers related to cache in http:1. Pragma: Only the fixed no-Cache value can be used in HTTP/1.0 to disable browser cache.2. Expires: Used to specify when the cached document is deemed to have expired, in GMT format. if the date

Using Java for file copy I believe many people will use, but is it the best efficiency?Recently I looked at NiO and decided to try the performance improvement of Java NIO. The first method: The old way public static long Forjava (File f1,file F2)

This article describes in detail multiple methods for obtaining Timestamp and time difference from nodejs, which is helpful for the use of nodejs at ordinary times. Let's take a look at it. There are many methods to obtain the timestamp in Nodejs,

Test the Code directly.Copy codeThe Code is as follows:Var aa = "{name: 'cora', item: [{age: 11}, {age: 22}, {age: 23}, {age: 23}]} ";Var now = new Date (). getTime ();For (var I = 0; I Var a = eval ("(" + aa + ")");}Var now1 = new Date (). getTime (

This article mainly explains in detail the qq qr code logon principle js code, which has some reference value. interested friends can refer to the use of QR code to log on in many places, QR code payment, QR code account and other applications (QR

This article will show you which eval and newFunction should you choose? For more information, see Test the Code directly. The Code is as follows: Var aa = "{name: 'cora', item: [{age: 11}, {age: 22}, {age: 23}, {age: 23}]} ";Var now = new Date ().

Test the Code directly.Copy the Code as follows: VaR AA = "{Name: 'cora', item: [{age: 11}, {age: 22}, {age: 23}, {age: 23}]} "; VaR now = new date (). gettime (); For (VAR I = 0; I VaR A = eval ("(" + AA + ")"); } VaR now1 = new date (). gettime ()