React与CSS3实现微信拆红包动画

微信红包曾经引爆过一系列的营销热潮，相信大家对于这种红包形式并不陌生，这里本着娱乐至上的精神用React简单地实现了拆红包的动画效果，供大家一起交流学习

用CSS3绘制红包

.redpack {
  height: 450px;
  background: #A5423A;
  width: 300px;
  left: 0;
  top: 0;
  border-radius: 10px;
  margin: 0 auto;
}
.topcontent {
    height: 300px;
    border: 1px solid #BD503A;
    background-color: #BD503A;
    border-radius: 10px 10px 50% 50% / 10px 10px 15% 15%;
    box-shadow: 0px 4px 0px -1px rgba(0,0,0,0.2);
}
#redpack-open {
    width: 100px;
    height: 100px;
    border: 1px solid #FFA73A;
    background-color: #FFA73A;
    border-radius: 50%;
    color: #fff;
    font-size: 20px;
    display: inline-block;
    margin-top: -50px;
    box-shadow: 0px 4px 0px 0px rgba(0, 0, 0, 0.2);
}

<p class='redpack'>
  <!--  红包的顶部盖子 -->
  <p class="topcontent"></p>
  <!-- 拆红包的按钮 -->
  <p id="redpack-open"></p>
</p>

效果如图：

用React来区分不同的状态的转换

用React.js来实现的话，主要通过判断state来控制红包现在是等待拆开还是已经拆开过，具体的代码如下

import React from 'react';
class ReadPacket extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            animation: false,
            status: 0  // 0: 等待拆开 1: 拆开后
        };
    }
    render() {
        var bonus = this.props.thanks ? 0 : parseFloat(this.props.surveyInfo.bonus);
        if(this.state.status == 0) {
            return (
                <p className='redpack-container' id='redpack-container'>
                    <p className='redpack'>
                        <p className='topcontent'>
                            <p id='redpack-opened'>
                              <p className='redpack-avatar'>
                                <img src='http://placehold.it/80x80' alt='头像' width='80' height='80'/>
                              </p>
                            </p>
                            <h2 style={{marginTop: 80, color: 'white'}}>奖励</h2>
                            <span className='redpack-text'>点击下方按钮领取红包</span>
                            <p className='redpack-description white-text'>恭喜发财 大吉大利</p>
                        </p>
                        <p id='redpack-open' className={this.state.animation ? 'rotate' : ''}
                             onClick={this.openRedPacket.bind(this)}
                        >
                            <span>拆红包</span>
                        </p>
                    </p>
                </p>
            );
        } else if (bonus == 0) {
            // 谢谢参与
            return (
                <p className='redpack-container' id='redpack-container'>
                    <p className='redpack'>
                        <p className='topcontent-open'>
                            <p className='redpack-avatar'>
                                <span id='close'></span>
                            </p>
                            <h1 style={{marginTop: 180, color: 'white'}}> 谢谢参与 </h1>
                            <span className='redpack-text'>多多参与的奖励的机会更多哦</span>
                            <br/>
                            <a onClick={this._toWallet.bind(this)}
                               style={{cursor:'pointer',textDecoration: 'underline', color: 'white'}}>
                                去我的账户查看
                            </a>
                        </p>
                        <p id='redpack-opened'>
                          <p className='redpack-avatar'>
                            <img src='http://placehold.it/80x80' alt='头像' width='80' height='80'/>
                          </p>
                        </p>
                    </p>
                </p>
            );
        } else {
            // 显示奖励金额
            return (
                <p className='redpack-container' id='redpack-container'>
                    <p className='redpack'>
                        <p className='topcontent-open'>
                            <p className='redpack-avatar'>
                                <span id='close'></span>
                            </p>
                            <h1 className='white-text' style={{marginTop: 180}}> {bonus.toFixed(2)} </h1>
                            <span className='redpack-text'>奖励积分已经存入您的账户</span>
                            <a className='btn-flat white-text' onClick={this._toWallet.bind(this)}
                               style={{textDecoration: 'underline'}}>
                                去我的账户查看积分
                            </a>
                        </p>
                        <p id='redpack-opened'>
                          <p className='redpack-avatar'>
                            <img src='http://placehold.it/80x80' alt='头像' width='80' height='80'/>
                          </p>
                        </p>
                    </p>
                </p>
            );
        }
    }
    stopAnimation() {
        this.setState({animation: false});
    }
    showResult() {
        this.setState({status: 1});
    }
    openRedPacket() {
        this.setState({animation: true});
        setTimeout(this.stopAnimation.bind(this), 3000);
        setTimeout(this.showResult.bind(this), 4000);
    }
    _toWallet() {
      // 跳转到钱包
      window.location.hash = '/wallet';
    }
}
export default ReadPacket;

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