text: const CountDown = require('../src/index');
  CountDown.init({date:'2018/06/08 21:23',callback:()=>{
      console.log('第一个ok')
  },update:(count)=>{
      console.log('第一个还剩:'+count )
  }}).init({date:1528437024045,callback:()=>{
      console.log('第二个ok')
  },update:(count)=>{
      console.log('第二个还剩:'+count )
  }})
  CountDown.init({date:20,callback:()=>{
      console.log('第三个ok')
  },update:(count)=>{
      console.log('第三个还剩:'+count )
  }});