JS Strings and Control statements

string of 1.js

* String
*   string is one of the JS data types
* string concatenation: +, plus has two meanings
*  1, the addition operation in mathematics;
*  2, string connection, when the plus sign on either side is a string, that is the meaning of the string connection;

<! DOCTYPE html>
Process Control in 2.js
* Demand
*   when clicked, let box toggle between show and hide
Analysis
*  1, get the button, box
*  2. Add a Click event to the button
*    Depending on the display property of box
*    If box is displayed, let it hide
*    If it's a shadow, let it show
*
* Style   It operates inline style, preferably do not use inline style, otherwise it will make HTML particularly bloated

<! DOCTYPE html>
* Demand: Click on the Next button, let the image switch to the next picture
*       Click on the previous photo to switch the image to the previous picture
Analysis
*   1, get to the Next button
*   2. Add a Click event to the button
*       A, using the property operation method to modify the image src;
*       B, put the number in a variable, click on the next one, let this variable add 1. The method of string concatenation is used to modify the SRC attribute of the image;
*
*  Cumulative
*     n=n+1
*     n+=1;
*     n++;
<! DOCTYPE html>
　
The following example describes document processing
* Requirements: Click on the button to display the contents of the input box
*
Analysis
* 1, analysis to buttons, text box, box
* 2. Add a Click event to the button
*       A, get user input content (text and Vlue)
*       B. Display the Acquired content in box
<! DOCTYPE html>
JS Strings and Control statements