我對以下代碼有疑問，它會引發類似語法錯誤的錯誤，但我遵循的指南說語法是正確的。不知道怎么辦，沒看懂，請幫忙。
這是代碼鏈接：
const car = {
maker: 'Ford',
model: 'Fiesta',
drive() {
console.log(`Driving a ${this.maker} ${this.model} car!`)
}
}
car.drive()
// the same above code can be written as:
const bus = {
maker: 'Ford',
model: 'Bussie',
drive: function() {
console.log(`Driving a ${this.maker} ${this.model} bus!`)
}
}
bus.drive()
// the same code above can be written in this way:
const truck = {
maker: 'Tata',
model: 'Truckie',
truck.drive = function() {
console.log(`Driving a ${this.maker} ${this.model} truck!`)
}
}
truck.drive()
// Now, let us see how the arror function works:
const bike = {
maker: 'Honda',
model: 'Unicorn',
drive: () => {
console.log(`Driving a ${this.maker} ${this.model} bike!`)
}
}
bike.drive()
錯誤：
SyntaxError: Unexpected token '.'
at line: truck.drive = function() {
uj5u.com熱心網友回復：
你可能誤讀了。等效代碼為：
// the same code above can be written in this way:
const truck = {
maker: 'Tata',
model: 'Truckie'
}
truck.drive = function() {
console.log(`Driving a ${this.maker} ${this.model} truck!`)
}賦值truck.drive是在初始化之后truck，而不是在物件字面量內。
首先，您不能將賦值放在物件文字中，只能放在屬性宣告中。其次，在賦值完成之前，您不能參考正在定義的變數。
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標籤：javascript 语法错误