项目需求,需要根据当前的图片的路径值的来(加或者减)动态改变其值: state定义如下:
this.state={ basket01:0+require("../../img/egg/egg1_00.png"), basket02:0+require('../../img/egg/egg2_00.png'), basket03:0+require('../../img/egg/egg3_00.png'), basket04:0+require('../../img/egg/egg4_00.png'), }
重点就是前面的数值:
render 代码如下:
<img className="egg-pen" src={this.state.basket01.substring(1,this.state.basket01.length)} alt=""/>
计算操作的方法代码为:
add (index){ let basket01Num = this.state.basket01.substring(0,1) let basket02Num = this.state.basket02.substring(0,1) let basket03Num = this.state.basket03.substring(0,1) let basket04Num = this.state.basket04.substring(0,1) let eggSum = this.state.eggSum this.setState({ eggSum:--eggSum }) if(index === 1){ ++basket01Num this.setState({ basket01:basket01Num+require(`../../img/egg/egg1_0${basket01Num}.png`) }) }else if(index === 2){ ++basket02Num this.setState({ basket02:basket02Num+require(`../../img/egg/egg2_0${basket02Num}.png`) }) }else if(index === 3){ ++basket03Num this.setState({ basket03:basket03Num+require(`../../img/egg/egg3_0${basket03Num}.png`) }) }else{ ++basket04Num this.setState({ basket04:basket04Num+require(`../../img/egg/egg4_0${basket04Num}.png`) }) } }
项目实现的效果:
通过加减来改变图片里面的鸡蛋数量