英文:
How do I debug a Javascript class that is part of a React application?
问题
当我开发一个React组件时，我使用console.log()语句进行调试。当组件被渲染时，console.log()语句会被打印到控制台，这是我目前用于调试的全部内容。
但是，我如何调试JavaScript类呢？我想在JavaScript类中也使用我的console.log()语句。但是该类本身不会被渲染到DOM中，所以位于该类中的console.log()语句也不会被打印到控制台。
一个简单的JavaScript类。
class MyClass {
constructor(name) {
this.name = name;
}
sayHello() {
console.log(`Hello, ${this.name}!`);
}
}
英文:
When I develop a React Component, I use the console.log() statement for debugging. When the component is rendered, the console.log() statement is printed into the console and that is all that I presently use for my debugging.
But how do I debug a javascript class? I would like to use my console.log() statements also in a Javascript class. But how can I do that? The problem is that the class itself does not get rendered into the DOM, so the console.log() statements [placed in the class] are also not printed into the console.
A simple Javascript class.
class MyClass {
constructor(name) {
this.name = name;
}
sayHello() {
console.log(`Hello, ${this.name}!`);
}
}
答案1
得分: 1
只有在从实例调用函数sayHello时，才会执行console.log()，然后您可以在控制台中看到它。现在您没有在任何地方调用sayHello。
class MyClass {
constructor(name) {
this.name = name;
}
sayHello() {
console.log(`Hello, ${this.name}!`);
}
}
const obj = new MyClass('Jimmy Dean');
obj.sayHello()
英文:
Only when you call the function sayHello from an instance will the console.log() execute and you can see it inside the console. Right now you are not calling sayHello anywhere.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
class MyClass {
constructor(name) {
this.name = name;
}
sayHello() {
console.log(`Hello, ${this.name}!`);
}
}
const obj = new MyClass('Jimmy Dean');
obj.sayHello()
<!-- end snippet -->
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