javascript - 使用 fetch 后数组值变得未定义

Question

当我想获取数组值时，它变得未定义。我在做什么磨损以及如何解决它？

var cars = [4, 8];
for (i = 0; i < cars.length; i++) {

  fetch("http://example.com?id=" + cars[i], {
      "credentials": "include",
      "headers": {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0",
        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
        "Accept-Language": "en-US,en;q=0.5",
        "Upgrade-Insecure-Requests": "1",
        "Cache-Control": "max-age=0"
      },
      "method": "GET",
      "mode": "cors",
    })

    .then(response => response.text())
    .then(str => {
      var text = str.split('yesyes')[1];
      var abc = text.split('nono')[0];
      document.write(abc + " = " + cars[i]);
    })
}

标签： javascriptarraysfor-loopfetchundefined

Answer 1

这是关于关闭。尝试这个：

for (var i = ...) {
  (function (x) {
    fetch("..." + cars[x], ... 
  })(i);
}