native-echarts 图表滚轮上下滚动，左右拖动，双击缩小，修正

修改 native-echarts 下 src 下 components 下 Echarts 下的 index.js   代码如下，注释是源码

import React, { Component } from 'react';
import { WebView, View, StyleSheet, ScrollView } from 'react-native';
import renderChart from './renderChart';
import echarts from './echarts.min';

export default class App extends Component {
  // componentWillReceiveProps(nextProps) {
  //   if(nextProps.option !== this.props.option) {
  //     this.refs.chart.reload();
  //   }
  // }

  // render() {
  //   return (
  //     <View style={{flex: 1, height: this.props.height || 400,}}>
  //       <WebView
  //         ref="chart"
  //         scrollEnabled = {false}
  //         injectedJavaScript = {renderChart(this.props)}
  //         style={{
  //           height: this.props.height || 400,
  //           backgroundColor: this.props.backgroundColor || 'transparent'
  //         }}
  //         scalesPageToFit={false}          
  //         source={require('./tpl.html')}
  //         onMessage={event => this.props.onPress ? this.props.onPress(JSON.parse(event.nativeEvent.data)) : null}
  //       />
  //     </View>
  //   );
  // }
  
  // 预防过渡渲染
  shouldComponentUpdate(nextProps, nextState) {
    const thisProps = this.props || {}
    nextProps = nextProps || {}
    if (Object.keys(thisProps).length !== Object.keys(nextProps).length) {
        return true
    }
    for (const key in nextProps) {
        if (JSON.stringify(thisProps[key]) != JSON.stringify(nextProps[key])) {
            return true
        }
    }
    return false
}
componentWillReceiveProps(nextProps) {
    if(nextProps.option !== this.props.option) {
// this.refs.chart.reload();
// 解决数据改变时页面闪烁的问题
        this.refs.chart.injectJavaScript(renderChart(nextProps))
    }
}
render() {
  return (
      <ScrollView style={{flex: 1, height: this.props.height || 400,}}>
          <WebView
              ref="chart"
              scrollEnabled = {false}
              injectedJavaScript = {renderChart(this.props)}
              style={{
                height: this.props.height || 400,
                backgroundColor: this.props.backgroundColor || 'transparent'
              }}
              scalesPageToFit={Platform.OS === 'android' ? true : false}

              source={require('./tpl.html')}
              onMessage={event => this.props.onPress ? this.props.onPress(JSON.parse(event.nativeEvent.data)) : null}
          />
      </ScrollView>
  );
}

}