Ajax

In js, we need to check whether the variable is a number. We can directly use the isNaN function. The isNaN function judges the opposite. If you input a number, it returns false, not the data, you can clear this point. IsNaN Function IsNaN

In javascript, if we want to obtain the object content, js provides three methods for us: outerhtml, innerhtml, and innertext. But what is the difference between them and their specific usage, maybe many people do not know. Sample Code:

The core principle of redirection is that the user adds a change to the select statement. When the user clicks, The js obtains the value of the selected select statement and jumps, for more information, see. My most commonly used code, the core code

Common cross-origin requests in js include four types: window. name, JSONP, jQuery. the first method is to use iframe, the second and third methods use json data, and the last one is xml file operations. Here is a brief introduction. 1. window. name

We generally use window to refresh the framework in js. parent command, which is used to refresh the parent window in a child window. to refresh the parent window, specify the window. parent [Window name] to operate. Next I will give you an instance.

This article introduces the tips for improving the readability of JavaScript code. Here we will introduce the methods. For more information, see. Flattening Logic In our work, we may encounter some complicated logic, such as: Meet condition 1, or XX;

In the webpage, the button does not have the attribute of tag a. If we want to add a jump event to the button, we can click the jump js on The onclick event, below I will introduce some common methods. How can I jump to another page by clicking the

Some time, we do not want the editor to have online management functions. For example, our message board certainly does not want other users to directly have online image management functions. How can we delete these functions, the following article

For many times, we do not know how to judge whether a variable is an array or an object. Next I will give you a detailed introduction to js to determine whether a variable is an object or an array instance. All typeof objects are returned. In

This article describes how to solve the problem that JavaScript cannot read the src file of the script tag. Script tag Generally, when we create a script tag on the page, src either introduces an external js file:? 1 script

This is the TAB (js + css) switching technology that I often use in website design. One is click switching, and the other is touch switching, which is comprehensive. Although there will be a lot of online searches, the tabs below are carefully

In js, it is easy to directly use window to achieve page Jump. location. href can be implemented. If you want to perform a scheduled jump, you need to use the setTimeout Function to set a scheduled jump. I will summarize it for you. The following is

We often need to look for some characters in the string or some content in html. Next I will introduce how to use the js indexOf method, according to the syntax of the indexOf method, stringObject. indexOf (the string to be searched, the position

The principle of private instance variables is based on the scope. Private instance variables are implemented using the var keyword in JavaScript Functions and only valid within functions. If you have been familiar with other languages, you should

This article introduces how to solve js new date () function not supported in IE browser. For more information, see. Solution 1 The Code is as follows: Copy code Function NewDate (str ){If (str = null)Return false;Str = str.

PNG images are transparent in other browsers and can have a perfect example of transparent background effect without any processing. However, ie6 cannot recognize the png Image transparency function in ie6, next I will introduce several methods for

There are many methods to search for characters in js. One is to search for a specific string and return a string, and the other is to find the position of the string. I will share with you their implementation methods. Searches for a specific

In js, RegExp objects have three methods: test (), exec (), and compile (). They can all be used to find strings, the following is a summary of their usage. Example 1: exec () 1, The Code is as follows: Copy code

Ajax is often used, but most of the ajax compatibility found on the Internet is not strong. I have changed a good and compatible ajax function, and the jquery ajax compatibility introduced later is also very strong. Example The Code is as

To determine whether a user is a mobile browser is actually very simple. We only need to obtain the userAgent information of the browser, and then we can determine and match the userAgent to determine whether the user is a mobile browser. Recently,