Introduction to applet

Composition of applet code - WXML Templates

1. What is? WXML

2. WXML and HTML The difference between

Composition of applet code - WXSS style

1. What is? WXSS

2. WXSS and CSS The difference between

Composition of applet code - JS Logical interaction

1. In the applet .js file

2. Small program .js Classification of documents

Composition of applet code - WXML Templates

1. What is? WXML
   WXML（WeiXin Markup Language） It is a set of small program framework design Tag language , The structure used to build applet pages , Its function is similar to that in web page development HTML.
2. WXML and HTML The difference between
   ① Different label names
   HTML （div, span, img, a）
   WXML（view, text, image, navigator）
   ② Attribute nodes are different
   Hyperlinks
   
   ③ Similar to Vue Template syntax in
   Data binding
   The list of rendering
   Conditions apply colours to a drawing
   aaa
   aaa

aaa

aaa

div Label cannot wrap in applet

Composition of applet code - WXSS style

1. What is? WXSS
   WXSS (WeiXin Style Sheets) It's a set Style language , Used to describe WXML Component style , Similar to... In web development CSS.
2. WXSS and CSS The difference between
   ① Added rpx Unit of measure
   CSS Pixel unit conversion needs to be carried out manually in , for example rem
   WXSS Support new units of size at the bottom rpx, On screens of different sizes, the applet will automatically convert
   ② Provides global and local styles
   In the project root directory app.wxss Will work on all applet pages
   Of partial pages .wxss The style is only valid for the current page
   ③ WXSS Only partial CSS Selectors
   .class and #id
   element
   Union selector 、 Descendant selector
   ::after and ::before Such as pseudo class selector
   Of course you can put HTML and CSS Put it in the applet ：
   effect ：

HTML（ Put in WXML in ）:

<!--pages/tsj/tsj.wxml-->
 
<button class="c-button c-button--gooey"> Hover me
  <div class="c-button__blobs">
  <div></div>
  <div></div>
  <div></div>
  </div>
</button>
<svg style="display: block; height: 0; width: 0;" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="goo">
      <feGaussianBlur result="blur" stdDeviation="10" in="SourceGraphic"></feGaussianBlur>
      <feColorMatrix result="goo" values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 18 -7" mode="matrix" in="blur"></feColorMatrix>
      <feBlend in2="goo" in="SourceGraphic"></feBlend>
    </filter>
  </defs>
</svg>

CSS（ Put in WXSS in ）:

/* pages/tsj/tsj.wxss */
/* From www.lingdaima.com */
.c-button {
    
 
  color: #000;
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  padding: 0.9em 1.6em;
  cursor: pointer;
  display: inline-block;
  vertical-align: middle;
  position: relative;
  z-index: 1;
 }
 
 .c-button--gooey {
    
  color: #06c8d9;
  text-transform: uppercase;
  letter-spacing: 2px;
  border: 4px solid #06c8d9;
  border-radius: 0;
  position: relative;
  transition: all 700ms ease;
 }
 
 .c-button--gooey .c-button__blobs {
    
  height: 100%;
  filter: url(#goo);
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  bottom: -3px;
  right: -1px;
  z-index: -1;
 }
 
 .c-button--gooey .c-button__blobs div {
    
  background-color: #06c8d9;
  width: 34%;
  height: 100%;
  border-radius: 100%;
  position: absolute;
  transform: scale(1.4) translateY(125%) translateZ(0);
  transition: all 700ms ease;
 }
 
 .c-button--gooey .c-button__blobs div:nth-child(1) {
    
  left: -5%;
 }
 
 .c-button--gooey .c-button__blobs div:nth-child(2) {
    
  left: 30%;
  transition-delay: 60ms;
 }
 
 .c-button--gooey .c-button__blobs div:nth-child(3) {
    
  left: 66%;
  transition-delay: 25ms;
 }
 
 .c-button--gooey:hover {
    
  color: #fff;
 }
 
 .c-button--gooey:hover .c-button__blobs div {
    
  transform: scale(1.4) translateY(0) translateZ(0);
 }

Composition of applet code - JS Logical interaction

1. In the applet .js file
   It is not enough for a project to only provide interface display , In the applet , We go through .js File to handle user operations . for example ： Respond to user clicks 、 Get the user's location and so on .
2. Small program .js Classification of documents
   In the applet JS Documents fall into three broad categories , Namely ：
   ① app.js
   yes The entry file of the whole applet project , By calling App() function To start the whole applet
   ② Page .js file
   yes Entry file for page , By calling Page() function To create and run the page
   ③ ordinary .js file
   yes Common function module files , To encapsulate Public functions or properties For page use