无法从量角器回调中访问数组 [英] Can't access array from within protractor callback

问题描述

我是量角器和 javascript 的新手.我遇到了一个我无法弄清楚的范围界定问题.在下面的代码段中，第一个数组访问语句有效，但第二个无效.什么给?

I'm new to both protractor and javascript. I ran into a scoping issue which I can't figure out. In the code segment below, the first array access statement works but the second doesn't. What gives?

for(var i=0;i<=1;i++){
    console.log(msgs[i]);
    element.all(by.className("form-group")).get(i).element(by.className("alert alert-danger")).getText().then(function(txt){                
        console.log(msgs[i]);
    });
}

推荐答案

你只需要改变

... .getText().then(function(txt){ ... });

到

... .getText().then((txt) => { ... });

它被称为粗箭头函数并且它没有自己的this，因此您可以访问您的数组.

It's called fat arrow function and it does not have it's own this so you can access your array.

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