Object is used by Prototype as a namespace; that is, it just keeps a few new methods together, which are intended for namespaced access (i.e. starting with “Object.”).
My personal understanding of the namespace mentioned above is equivalent to C# The static class in , which means providing tool functions, should not be the same concept as the namespace in C#. Because the namespace in C# is not directly followed by a method, it must be an object and then call the method, but it is somewhat similar to the namespace in C
clone
extend
inspect
isArray
isElement
isFunction
isHash
isNumber
isString
isUndefined
keys
toHTML
toJSON
toQueryString
values
//Create Object object by anonymous function call
(function() {
//Get the string expression of the type, (Prototype learning - tool function learning ($ method)) There are detailed instructions in this log
function getClass(object) {
return Object.prototype.toString.call(object)
.match(/^[objects(.*)]$/)[1];
}
//Inherited method, very simple The class copying mechanism is to copy all the properties and methods in the source to the destination. If it is a reference type, the source and destination will point to the same address
function extend(destination, source) {
for ( var property in source)
destination[property] = source[property];
return destination;
}
//Return the string expression of object
function inspect(object ) {
try {
if (isUndefined(object)) return 'undefined';
if (object === null) return 'null';
return object.inspect ? object.inspect( ) : String(object);
} catch (e) {
if (e instanceof RangeError) return '...';
throw e;
}
}
//Return the JSON of object (JavaScript Object Notation)
function toJSON(object) {
var type = typeof object;
switch (type) {
case 'undefined':
case 'function':
case 'unknown': return;
case 'boolean': return object.toString();
}
if (object === null) return ' null';
if (object.toJSON) return object.toJSON();
if (isElement(object)) return;
var results = [];
for (var property in object) {
var value = toJSON(object[property]);
if (!isUndefined(value))
results.push(property.toJSON() ': ' value);
}
return '{' results.join(', ') '}';
}
//Return query string, for example: param1=value1¶m2=value2
function toQueryString(object) {
return $H(object).toQueryString();
}
//Return HTML string
function toHTML(object) {
return object && object.toHTML ? object.toHTML() : String.interpret(object);
}
//Get all keys of object
function keys(object) {
var results = [];
for (var property in object)
results.push(property);
return results;
}
//Get all values of object
function values(object) {
var results = [];
for (var property in object)
results.push(object[property]);
return results;
}
//Copy all properties and methods in object to an empty object, and return
function clone(object) {
return extend({ }, object);
}
//Determine whether the object is a basic DOM Element
function isElement(object) {
return !!(object && object.nodeType == 1);
}
//Judge whether object is an array
function isArray(object) {
return getClass(object) === "Array";
}
//Judge whether object is Prototype Hash object
function isHash(object) {
return object instanceof Hash;
}
//Determine whether object is a function
function isFunction(object) {
return typeof object === "function";
}
//Determine whether object is a string
function isString(object) {
return getClass(object) === "String";
}
//Determine whether object is a number
function isNumber(object) {
return getClass(object) === "Number";
}
//Determine whether object has been defined
function isUndefined(object) {
return typeof object === "undefined";
}
//Return Object object
extend( Object, {
extend: extend,
inspect: inspect,
toJSON: toJSON,
toQueryString: toQueryString,
toHTML: toHTML,
keys: keys,
values: values,
clone: clone,
isElement: isElement,
isArray: isArray,
isHash: isHash,
isFunction: isFunction,
isString: isString,
isNumber: isNumber ,
isUndefined: isUndefined
});
})();
inspect method:
Object.inspect() // -> 'undefined'
Object.inspect(null) // -> 'null'
Object.inspect(false) // -> 'false'
Object.inspect([1, 2, 3]) // -> '[1, 2, 3]'
Object.inspect('hello') // -> "' hello'"
toJSON method:
Note that there is a recursive calling process var value = toJSON(object[property]); and finally returns a JSON format String representation, let’s take a look at the example:
var data = {name: 'Violet', occupation: 'character', age: 25, pets: ['frog', 'rabbit']};
/* '{"name": "Violet", "occupation": " character", "age": 25, "pets": ["frog","rabbit"]}' */
//Remember to add parentheses when eval returns the JSON string, otherwise an error will be reported, here Parentheses serve to force evaluation.
//Otherwise, the JSON string will be regarded as a compound statement, and the ("name":) inside will be regarded as a Label, and then an error will occur when parsing the following content
var obj=eval('(' Object.toJSON (data) ')');
alert(obj.name);
toQueryString method:
Create a Hash object with object, and then call the Hash object toQueryString method, and returns the call result. When talking about Hash objects, the toQueryString method will be discussed in detail.
Generally this method is often used when calling Ajax.Request. Let’s take a look at an example:
Object.toQueryString({ action: 'ship', order_id: 123, fees: ['f1', 'f2'], 'label': 'a demo' })
// -> 'action=ship&order_id=123&fees=f1&fees=f2&label=a demo'
toHTML method:
If the object parameter passed in is undefined or null Will return an empty string
alert(Object.toHTML())
alert(Object.toHTML(null))
If object defines the toHTML method, call the toHTML method of object, otherwise call String's The static method interpret actually judges whether the object is null. If it is null, it returns ''. Otherwise, it calls the toString method of the object and returns the call result
Object.extend(String, {
interpret: function(value) {
return value == null ? '' : String( value);
},
specialChar: {
'b': '\b',
't': '\t',
'n': '\n',
'f': '\f',
'r': '\r',
'\': '\\'
}
});
Look at the example below:
var Bookmark = Class.create({
initialize: function(name, url) {
this.name = name;
this.url = url;
},
toHTML : function() {
return '#{name}'.interpolate(this);
}
});
var api = new Bookmark('Prototype API', 'http://prototypejs.org/api');
Object.toHTML(api);
//- > 'Prototype API'
keys and values methods:
You will understand it after looking at the example, so I won’t go into details:
Object.keys()
// -> []
Object.keys({ name: 'Prototype', version: 1.5 }). sort()
// -> ['name', 'version']
Object.values()
// -> []
Object.values({ name: 'Prototype ', version: 1.5 }).sort()
// -> [1.5, 'Prototype']
clone method:
'{} ' is the direct quantity of the empty object, equivalent to new Object()
var o = { name: 'Prototype', version: 1.5, authors: ['sam', 'contributors'] };
var o2 = Object.clone(o);
o2.version = ' 1.5 weird';
o2.authors.pop();
o.version // -> 1.5
o2.version // -> '1.5 weird'
o.authors // -> ['sam']
// Ouch! Shallow copy!, pay attention here!
I won’t talk about the isXXX method.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.


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