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Javascript tutorial

Implementation ideas and code for printing the current time in javascript

Copy the code code as follows:<html><head><title></title><script> /* //声明时间 var date = new Date(); alert(date);//当前时间 alert(date.toLocale

2025-03-03
How to disable browser back button in javascript

1. Copy the code as follows:<script language="JavaScript"> javascript:window.history.forward(1); </script>Using JS to generate a "forward" action to offset the back function, this method

2025-03-03
6 features of JavaScript asynchronous programming Promise mode

Before we start the formal introduction, we want to see what Javascript Promise looks like: the copy code is as follows: var p = new Promise(function(resolve, reject) {resolve("hello world");})

2025-03-03
How to get and set properties by js

The code copy is as follows: function square(num){var total = num*num;//local variable return total;}var total = 50;//global variable var number = square(20);alert

2025-03-03
js pop-up layer is always centered implementation ideas and code

The pop-up layer window is always centered. Copy the code as follows:<script type="text/javascript"> var isIE=window.XMLHttpRequest?false:true; var aIsIE={}; window.onlo

2025-03-03
JavaScript calculation of the remaining days of the month (number of days calculator) for example code

The code is as follows: Copy code code as follows: <script language="JavaScript"><!-- Beginvar today = new Date();var now = today.getDate();var year = today.

2025-03-03
Switch case loop example code in js

Copy the code as follows: switch (objNameType) { case 'PD': valueUD = obj.id; id = objName; var loadVUD = UserData.load(exam, id); if (lo

2025-03-02
Two usage examples of call in Javascript

Usage 1 (common usage): The expression is: an object.method.call(another object), which means replacing the current object with another object and executing the method of the current object. Let’s look at the example first: copy the code as follows: funct

2025-03-02
Example of count sorting of Javascript sorting algorithm

Counting sort is a stable sorting algorithm. Count sorting uses an additional array Count_arr, where the i-th element is the number of elements with a value equal to i in the array Arr to be sorted. Then, according to the array Count_arr, the elements in

2025-03-02
New understanding of Form form reset method

The reset method of the Form form in HTML is used to clear the content entered by the user. It has been mistakenly thought that it simply clears the values in input items such as input. But this is not actually the case. The essence of the reset metho

2025-03-02
Detailed analysis of the difference between js judging undefined type, undefined, null,

js determines the undefined type today when using showModalDialog to open the page and return the value. When the open page clicks the close button or directly clicks the close button on the browser, the return value is undefined, so be smart and judge va

2025-03-02
JS self -modem calls for the specific implementation of the anonymous function

JS often defines a function for temporary naming space. The variables defined in this naming space will not pollute the global naming space (prevent local variables from conflicting with global variables). Copy code code as follows: Function mymodule () {

2025-03-02
An example of the difference between undefined and not defined in javascript

After research, there is a big difference between the two. I don’t know what the difference is between the two in English. The research results are as follows: ubuntu Test browser: chrome Test case 1 console.log(a) ReferenceError : a is not defined

2025-03-02
Example of general table multi-table query

Copy the code as follows: //Clear the table $("#studentTab").empty(); $.ajax({ type:"POST", url:"../../student.action", dataType:"json ", data:{ "st

2025-03-02
JS webpage picture is based on the proportion of adaptive zoom implementation methods

Users upload photos, and the size of the photo is unknown; a preview needs to be generated. This preview map should be applied to the area provided by the preview of the user, and it is centered; if the picture is too large, it needs to be zoomed in propo

2025-03-02

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