未捕获的SyntaxError:在严格模式下出现意外的eval或参数:window.gtag =(参数)=> dataLayer.push(arguments); [英] Uncaught SyntaxError: Unexpected eval or arguments in strict mode: window.gtag = (arguments) => dataLayer.push(arguments);

问题描述

我有以下代码:

class MetricGoogleGateway extends AMetricGateway{
    constructor(id, name, token) {
        super(id, name);
        this.token = token;
    }

    configure() {
        if(!window.dataLayer && !window.gtag)
        {
             window.dataLayer = window.dataLayer || [];
             window.gtag = (arguments) => dataLayer.push(arguments);
        }

        gtag('js', new Date());
        gtag('config', 'UA-113071675-1');
    }
}

通过浏览器加载文件时，出现以下错误:

When the file is loaded by the browser, I got the following error:

未捕获到的SyntaxError:严格模式下出现意外的eval或参数

Uncaught SyntaxError: Unexpected eval or arguments in strict mode

但是，如果我在chrome控制台中运行以下行，则一切正常:

But if I I run the following lines in the chrome console, everything its ok:

window.dataLayer = window.dataLayer || [];
window.gtag = (arguments) => dataLayer.push(arguments);
window.gtag(1);
window.gtag(2);
console.log(window.dataLayer)
-> console.log result: [1,2]

注意:

我注意到，如果我改变了这一行:

I notice that if I changed the line:

window.gtag = (arguments) => dataLayer.push(arguments);

对于该行:

window.gtag = function(arguments) { dataLayer.push(arguments) }

我遇到相同的错误

推荐答案

您的代码位于class主体内，该主体在

Your code is inside a class body which runs in strict mode (as all your code should), unlike the snippet pasted into the console.

名称arguments和eval是特殊的，禁止将其用作标识符.不要使用它们.只需写args，或者甚至写出更好的东西，例如layer.

The names arguments and eval are special and forbidden as identifiers. Don't use them. Just write args instead, or even better something actually meanigful like layer.

window.gtag = (layer) => dataLayer.push(layer);

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