JavaScript object chain operation code (jquery)_js object-oriented
Although I have gradually reduced my use of jQuery now (I still use it on projects, it is more efficient. I basically don’t use it in daily life), I hope to reduce my dependence on jQuery.
But this chain operation method is really attractive (it seems that many new libraries now use chain operations).
Beginners are not afraid, so I wrote the following code. The main thing is to avoid forgetting it in the future, haha.
window.k = function() {
return new k.fn.init(arguments);
}
k.fn = k.prototype = {
init:function() {
this.length = 0;
//var args = Array.prototype.slice.call(arguments,0);
Array.prototype.push.apply(this,arguments[0]);
return this;
},
show: function() {
console.log(Array.prototype.slice.call(this,0).join("$"));
return this;
},
hide:function( ) {
console.log(this);
return this;
}
}
k.fn.init.prototype = k.fn;
console.log(k( "0",1,2,3,4,5).show().hide());
This is just a chain operation. But under firbug you can see that the jQuery object returns an array/class array. I want to achieve this but don't know how to do it. .
You can’t let k.fn.prototype = new Array(). It's really tiring to look at the jQuery source code. .
The following are some replies to netizens
In fact, the chain operation is very simple, that is, returning the operation object itself each time, so that all methods defined by the object itself can be continuously called.
The simplest example:
var o = function() {
/**
do something
*/
return this;
}
o.prototype = {
action1: function() {
/**
do something
*/
return this;
},
action2: function() {
/**
do something
*/
return this;
}
}
You can call it like this:
new o() //
.action1() //
.action2(); / /Every step of the operation returns an instantiated o object
It is actually equivalent to this:
var a = new o();//If this is not returned, then the call cannot be continued here. Because what is returned is undefined.
a.action1(); //At this time, you can only operate on a (a reference to the instantiated o object).
a.action2();
If you have used jQuery, you should have discovered it. jQuery does not require you to use new to instantiate an object, which is more convenient when using it.
So we define another object to encapsulate the o object mentioned above:
var k = function() {
return new o();
}
So we can call it like this Here's:
k().action1().action2();
I recommend you a method called "functionalization" to construct JS.
//Bold for emphasis
//This method is from 5.4 Functionalization on page 52 of "The Essence of JavaScript Language".
var constructor = function (spec,my){
var that, other private instance variables;
my = my || {};
Add shared variables and functions to my
that = a new object
Add privileged method to that
return that;
}

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.

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Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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