Javascript setter和getter返回不同的输出 [英] Javascript setter and getter return different outputs

问题描述

我一直在使用关键字get和set的JavaScript，但我认为我没有正确实现它.

I've been using the keyword get and set of JavaScript but I don't think that I'm implementing it correctly.

_maxWinnings: -1,
get maxWinnings() { 
    return this._maxWinnings;
}, 
setMaxWinnings : function( value ) {
    this._maxWinnings = value;
    // This works fine.
    // this.maxWinnings = value;
}

我已经进行了一系列测试，结果与预期不符.

I've done series of tests and the results are not as expected.

console.log( this.sgd._maxWinnings );
> -1
console.log( this.sgd.maxWinnings );
> -1
console.log( this.sgd.setMaxWinnings(10) );
> undefined
console.log( this.sgd._maxWinnings );
> 10
console.log( this.sgd.maxWinnings );
> -1

我希望你能帮助我.

推荐答案

setMaxWinnings : function( value ) {
    // This works fine:
    // this.maxWinnings = value;
}

不，不是.您已经编写了一个需要调用的setter方法(例如sgd.setMaxWinnings(10))，但如果要使用属性分配setter，则需要使用

No, it doesn't. You've written a setter method that you need to call (like sgd.setMaxWinnings(10)), but if you want a property assignment setter then you will need to use

set maxWinnings( value ) {
    this._maxWinnings = value;
}

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