表单体温实时验证

描述：用户填写完体温，需要实时验证体温是否合法，并给出提示

请输入体温" [formControl]="temperatureInput" name="temperatureName"/> import {FormControl} from '@angular/forms'; temperatureInput = new FormControl(); this.temperature = this.temperatureInput.value; // 获取温度值 this.temperatureInput.valueChanges       .pipe(debounceTime(1000))       .subscribe(v => {         if (v < 35 || v > 45) { // 如果温度输入超出预期，则提示错误           this.srv['warn']('温度填写有误', 3500);           return this.temperatureInput.setValue('');         }         const str = v.toString();         if (str.indexOf('.') > -1 && str.split('.')[1].length >= 2) {           const val = parseFloat(v) - 0; // 把input的value值转换为浮点数;           const txt = val.toFixed(1); // 当用户输入价格小数点超过2位数，强制变成小数点2位           this.temperatureInput.setValue(txt);         } else {           this.temperatureInput.setValue(v - 0);         }       });