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The first two days of analysis HashMap hash algorithm, met the >> and >>> the two symbols, then looked up the information, in the brain after a bit. Today again met, did not expect unexpectedly forget 0-0 ...I have this memory ah, not to say. Had to

TopicTopic One:if (! (" A "in window) {var a = 1;} alert (a); topic two: var a = 1,b = function A (x) {x && a (--x);}; alert (a); Title III: Function A (x) {return x * 2;} var A;alert (a); topic Four: Function B (x, Y, a) {arguments[2] = 10;alert (a)

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Python Study the third day1. python file types1) Source codePython source file with 'py' as extension, interpreted by Python program, no need to compileExample 1: vim 1.py#!/usr/bin/python As with the shell script, you need to indicate which

All the numbers in 1.ECMAScript are stored in the IEEE-754 64-bit format, but the bitwise operators do not directly manipulate the 64-bit values. The first 64 bits are converted to 32-bit integers, then manipulated, and the results are then turned

Reference Links:http://blog.csdn.net/liu88010988/article/details/50799978The Java.util.concurrent package is built entirely on CAS, and there is no CAs to have this package. The importance of CAs is visible.CasCas:compare and swap, translated into

Logical operationsTwo kinds of logical operations are supported in JavaScript, "Logical OR (| | and logic and (&&), their use is consistent with the basic Boolean operation:var str= ' Hello ';var obj = {};x = str | | Objy = str && obj;What is

Each language has its own uniqueness, or peculiar syntax, or uncommon functions, or non-standard ways of execution. Therefore, regardless of the new ding or veteran, looking at a certain feature will suddenly be drunk. The 10 "singular" features

Deep understanding of JS Regular expression---grouping Before writing an article on the beginner beginners, this thought to the regular expression relatively better understanding but today I met a pit, may be not careful why they are, today's focus

Security equals operator () This operator performs the same comparison operation as the = operator, although can be used to determine null values. When two operands are null, the return value is 1 and NOT null; When one operand is null, it

I. The role of JavaScript "= =" 1. When the content on either side of = = is a string, the contents of the string are compared to equal.2. When the content on both sides of = = is a number, compare the size of the number is equal.3. When the

The table structure is the same except for the index of the table name, and if the ' id ' field of each table is still in the ' auto_increment ' way, the ID cannot only determine a single record. This requires a mechanism in addition to the various

Data is stored in bytes on the computer, 1 bytes equals 8 bits (1byte=8bit), and the computer can recognize only 0 and 1 of these two digits, so 1 bytes can represent 256 different information according to the arrangement, i.e. 28 (0 and 12 possible,

List resolution and build expressions Imagine a requirement: we already have a list of Lista, LISTB, and now we need to generate a list LISTC so that LISTC is the result of +1 of each element in the Lista, or the result of a and b addition, what

The method of calculating the M-Power of T: (Exploring the implementation of C + + function pow (), combining mathematics with program design)SOURCE program Download: http://pjy.studio.googlepages.com/powP.cppOr to my favorites download.Because C + +

The variables in the shell are stored as strings, even if you assign values to the value of the shape unless you declare the variable by declare-i. In the case of numerical/arithmetic operations, you may find the following $ x=121$ echo $x

Description There is a square wall which is made the nxn small square bricks. Some bricks are white while Some bricks are. Bob is a painter and him wants to paint the bricks yellow. But there is something wrong with Bob ' s brush. Once he uses this

Server The configuration options for SQL Server servers are those that people understand less and are often misused. When a technical support person asks you to adjust an option in some way, and another technical support person asks you to adjust

In JavaScript, mathematical operations can be implemented in two different ways: 1.+ 、-、 *,/,% and other operators.2. Use the Math object's calculation function. For example, use Math.pow (2,3) to calculate 2 of the 3-time side. Unlike Java,

shift operatorThe shift operator is the translation of numbers on the basis of binary. According to the direction of the translation and the rules of padding numbers are divided into three kinds of:> (with symbol right move) and >>> (unsigned Right