


Big discount
SMS | Upload time< ;/td> |
Remarks | 1 | Had a meeting and found that was wrong | 2011-01-30 | 五 |
2 | Meeting found something wrong | 2011-01-30 | 五 |
3 | 2011-01-30 | 五 | |
4 | Meeting DiscoveryError | 2011-01-30 | 五 |
5 | Had a meeting and found that was wrong | 2011-01-30 | 五 |
|
五 | ||
Having a meeting found there was an error | 2011-01-30 | 五 |
함수 HashMap()
{
/ **지도 크기 **/
var 크기 = 0;
/**물체 **/
var 항목 = new Object();
/**살다 **/
this.put = 함수(키, 값)
{
if(!this.containsKey(key))
{
크기 ;
}
항목[키] = 값;
}
/**선택하다 **/
this.get = 함수(키)
{
if( this.containsKey(key) )
{
반환 항목[키];
}
else
{
null을 반환합니다.
}
}
/**삭제 **/
this.remove = function (key )
{
if( 항목 삭제[key] )
{
크기 --;
}
}
/**키 포함 여부 **/
this.containsKey = function ( key )
{
return (항목의 키);
}
/**값 포함 여부 **/
this.containsValue = 함수(값)
{
for(항목의 var prop)
{
if(entry[prop] == value)
{
return true;
}
}
false를 반환합니다.
}
/**모든 가치 **/
this.values = function ()
{
var value = new Array(size);
for(항목의 var prop)
{
values.push(entry[prop]);
}
반환 값;
}
/**모든 키 **/
this.keys = function ()
{
varkeys = new Array(size);
for(항목의 var prop)
{
keys.push(prop);
}
반환 키;
}
/**지도 크기 **/
this.size = function ()
{
반환 크기;
}
}
// var map = new HashMap();
/*
map.put("A","1");
map.put("B","2");
map.put("A","5");
map.put("C","3");
map.put("A","4");
*/
/*
alert(map.containsKey("XX"));
alert(map.size());
alert(map.get("A"));
alert(map.get("XX"));
map.remove("A");
alert(map.size());
alert(map.get("A"));
*/
/**객체를 키로 사용할 수도 있습니다 **/
/*
var arrayKey = new Array("1","2","3","4");
var arrayValue = new Array("A","B","C","D");
map.put(arrayKey,arrayValue);
var value = map.get(arrayKey);
for(var i = 0 ; i {
//alert(value[i]);
}
*/
/**객체가 Key로 사용되면 해당 객체의 toString() 메서드가 자동으로 호출됩니다. 실제로 String 객체가 Key*로 사용됩니다.*/
/**사용자 정의 객체인 경우 toString() 메서드를 재정의해야 합니다. 그렇지 않으면 다음과 같은 결과가 발생합니다.*/
// 함수 MyObject(이름)
// {
// this.name = 이름;
// }
/**
function MyObject(이름)
{
this.name = 이름;
this.toString = function ()
{
return this.name;
}
}
**/
// var object1 = new MyObject("小张");
// var object2 = new MyObject("소명");
//
// map.put(object1,"小张");
// map.put(object2,"소명");
// 경고(map.get(object1));
// 경고(map.get(object2));
// 경고(map.size());
//
/**실행 결과 닉네임 닉네임 크기 = 1 **/
/**toString() 메서드를 재정의하는 객체로 변경하면 효과가 완전히 달라집니다 **/

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

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JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

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