[Re-render rules]

src/components/QrItem.js

@@ -16,12 +16,16 @@ class QrItem extends React.Component {
         };
     }
 
+    componentDidMount() {
+        this.forceUpdate();
+    }
+
     handleClick(e) {
         this.props.onSelected(this.props.index);
     }
 
     shouldComponentUpdate(nextProps, nextState, nextContext) {
-        return nextProps.selected || this.props.selected
+        return (nextProps.selected || this.props.selected) && (this.props.text == nextProps.text || this.props.text.length == 0)
     }
 
     render() {

src/components/QrRendererRound.js

@@ -1,13 +1,7 @@
 import React from "react";
+import {srand, rand} from "../utils/util";
 import './Qrcode.css'
 
-function RandomNum(Min,Max){
-    const Random = Max - Min;
-    const random = Math.random();
-    const num = Min + random * Random;
-    return num;
-}
-
 function listPoint(props) {
     if (!props.qrcode) return []
 
@@ -20,7 +14,7 @@ function listPoint(props) {
     for (let i = 0; i < nCount; i++) {          //一维长度为5
         sizeTable[i] = new Array(i);    //在声明二维
         for (let j = 0; j < nCount; j++) {      //二维长度为5
-            sizeTable[i][j] = RandomNum(0.33,1);
+            sizeTable[i][j] = rand(0.33,0.8);
         }
     }
     var nearPoint = new Array();

src/components/Qrcode.js

@@ -127,6 +127,7 @@ class Qrcode extends React.Component {
                                         renderer={React.createElement(style.renderer, {
                                             qrcode: this.state.qrcode,
                                         })}
+                                        text={this.state.text}
                                         selected={index == this.state.selectedIndex}
                                         onSelected={this.handleSelected}
                                     />

src/utils/util.js

@@ -0,0 +1,10 @@
+let seed = 0;
+
+export function srand(sd) {
+    seed = sd;
+}
+
+export function rand(min, max) {
+    seed = (seed * 9301 + 49297) % 233280;
+    return min + (seed / 233280.0) * max;
+}