js switch case用法

会比if else简介很多，逻辑也会更清楚

        // 两位补零操作
        handleZeroFill(val,item){
          switch(item) {
            case 'openCircuitVoltage':
              this.form.openCircuitVoltage = Number(val).toFixed(2);
              break;
            case 'shortCircuitCurrent':
              this.form.shortCircuitCurrent = Number(val).toFixed(2);
              break;
            case 'ratedOperationalVoltage':
              this.form.ratedOperationalVoltage = Number(val).toFixed(2);
              break;
            case'ratedOperationalCurrent':
              this.form.ratedOperationalCurrent = Number(val).toFixed(2);
              break;
            default:
              this.form.test = 'this is a default'
          }
        },

?case 'openCircuitVoltage': 就等于 if(item === 'openCircuitVoltage'){}