JavaScript is a very popular programming language and is widely used in web development, mobile application development and other fields. In JavaScript, we can use some special methods to call functions in JavaScript files, and these functions can also be called in other functions. This is the so-called "call method call method call method". This article will introduce in detail how to call methods in js in JavaScript and how to call methods in methods.
1. Calling methods in js in JavaScript
Calling a function in a js file is very simple. You only need to use the <script> tag in the <head> tag of the HTML file to introduce it. js file and call the function where needed. For example, suppose there is a js file named "mymethod.js", which defines a function named "myfunction": </script>
function myfunction() {
alert("Hello World!");
}
We can use the following code in the HTML file to call the function:
<script></script> <script> myfunction(); </script>
In this way, when the web page is loaded, the "mymethod.js" file will be automatically introduced and the "myfunction" function will be executed.
2. Calling methods in JavaScript
To call methods in methods, we can use a method similar to calling functions in js files. Suppose there is the following code:
var obj = {
method1: function() {
console.log("This is method1");
},
method2: function() {
console.log("This is method2");
this.method1(); // 调用method1方法
}
};
We can use the following code to call the "method2" method:
obj.method2();
At this time, the console will output the following content:
This is method2 This is method1
From this you can It can be seen that the "method1" method is called inside the "method2" method through the statement "this.method1()", and the keyword "this" points to the current object "obj".
3. Function binding in JavaScript
In JavaScript, you can use the bind() method to bind a function to a specified internal object, so that when the function is called, it The this pointer always points to the internal object.
For example, there is the following code:
var obj1 = {
name: "Tom",
say: function() { console.log("My name is " + this.name); }
};
var obj2 = {
name: "Jerry"
};
We bind the function in the following way:
obj1.say.bind(obj2)();
The console will output the following content:
My name is Jerry
It can be seen that by using the bind() method, we can bind the "say" method to the "obj2" object, so that when the method is called, "this" points to "obj2" instead of "obj1" .
Summary:
In JavaScript, we can easily call functions in js files, call other functions inside the function, and even perform function binding to achieve more advanced programming effects. . Therefore, it is very important to be familiar with how functions are called in JavaScript. Developers can improve their skills through repeated practice.
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