Angular 7 - 布尔值始终为真

Question

我在 Angular 7 中有一个布尔值，我用它在对象构造函数中设置一个值。布尔值作为参数传递，我将其存储在本地。但是，由于某种原因，布尔值总是评估为真。这是有问题的代码：  ngOnInit() {    this.id = this.route.snapshot.params['id'];    this.showPersonal = this.route.snapshot.params['showPersonal'];    console.log("ngOnInit, this.id: " +  this.id);    console.log("ngOnInit, this.showPersonal: " +  this.showPersonal);    // if showPersonal is true, workRelated i.e. last item in constructor, is false    if (this.showPersonal){      console.log("showPersonal is true, setting work related to false")      this.showWorkRelated = false;    }    else {      console.log("showPersonal is false, setting work related to true")      this.showWorkRelated = true;     }console.log("this.showWorkRelated: " + this.showWorkRelated)这是输出：todo.component.ts:28 ngOnInit, this.showPersonal: falsetodo.component.ts:32 showPersonal is true, setting work related to falsetodo.component.ts:40 this.showWorkRelated: false我尝试了很多不同的方法，但它总是评估为真。这段代码有什么问题？

Answer 1

看起来您this.route.snapshot.params['showPersonal']返回一个字符串，false因此将if (this.showPersonal)其视为 true。

您应该尝试使用typeof this.showPersonal以查看变量是哪种类型。