Scroll事件不起作用:主线程上的同步XMLHttpRequest已弃用

Question

JS Fiddle here

因此，我从API中提取小部件，并尝试动态显示它们。在JS文件中，我在line 104上有一个scroll事件，它检测用户何时滚动到窗口底部。当它出现时，我希望它显示我存储在allWidgets数组中的下3个小部件。

在用户滚动之前，我从allWidgets数组中复制前三个小部件，将它们存储在单独的变量中，并将它们附加到页面。这是在line 94上。

当我第一次滚动到页面底部时，它将加载接下来的三个小部件。但当我下一次滚动到底部时，我得到了错误：

[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check <URL>.

有谁知道我怎么解决这个问题吗？真的很沮丧，我已经尝试了好几天了！

编辑:由于某种原因，JS不会保留我的scss。如果你想要，这是你要的：

@import url('https://fonts.googleapis.com/css?family=Lato:100&display=swap');
@import url('https://fonts.googleapis.com/css?family=Kulim+Park&display=swap');


$dark: #211b13;
$darker: darken($dark, 30%);
$light: lighten($dark, 10%);
$lighter: lighten($dark, 50%);
$accent: #d17c2c;
$light-accent: lighten($accent, 8%);

body {
  font-family: 'Lato', sans-serif;
  font-weight: 200;
  background: #fafafa;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1 {
  font-family: 'Lato', sans-serif;
  font-weight: 100;
}

h2 {
  font-family: 'Lato', sans-serif;
  font-weight: 100;
}

p {
    font-size: 1.1em;
    font-weight: 300;
    line-height: 1.7em;
    color: #999;
}

a {
  text-decoration: none;
}

a,
a:hover,
a:focus {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s;
}

li {
  list-style: none;
}

#content {
  background-image: url(../../Images/background-texture-3.png);
}

header {
  display: flex;
  justify-content: flex-start;
  background-image: url(../../Images/Demographic_Image.png);
}

header h1 {
  color: rgb(193, 193, 193);
  font-family: 'Lato', sans-serif;
  font-size: 1.5rem;
  margin: 2em 0 0 .2em;
  padding-bottom: .3em;
  @media (min-width: 768px) {
    font-size: 2.5rem;
    margin: 1.5em 0 0 .2em;
  }
}

// Quick Facts
.quick-background {
  background: linear-gradient(.25turn, #99f0c0, transparent);
}

.quick-facts {
  font-family: 'Kulim Park', sans-serif;
  background: url('../../Images/quick-facts-icn.png');
  background-size: cover;
  max-width: 40%;
  padding: .3em 0;
  animation: 1s ease-in-out 0s 1 quickFactSlide;
}

@keyframes quickFactSlide {
  0% {
    max-width: 40%;
    // border-radius: 0 100% 0 0;
    transform: translateX(-100%);
  }
  50% {
    transform: translateX(50%);
  }
  60% {
    transform: translateX(-10%);
  }
  100% {
    max-width: 40%;
    // border-radius: 0 100% 0 0;
  }
}


.quick-facts h4 {
  margin-bottom: 0;
  margin-left: .5em;
  font-style: italic;
}

.total-num {
  animation: 4s ease-in-out infinite totalNumColor;
}

@keyframes totalNumColor {
  0% {
    color: black;
  }
  50% {
    color: white;
  }
  100% {
    color: black;
  }
}

.total,
.num {
  margin-left: 1em;
}

.total p,
.num p {
  display: inline-block;
  margin-top: 0;
  margin-bottom: 0;
  color: black;
  font-weight: 300;
  font-size: 1rem;
}

.num {
  font-weight: 900 !important;
}

.widget-total-p {
  text-decoration: underline;
}


/*
    DEMO STYLE
*/


.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    // margin-bottom: 10px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-btn {
    box-shadow: none;
    outline: none !important;
    border: none;
}

#navbarSupportedContent {
  display: flex;
  justify-content: center;
}

.btn-info {
  background-color: $dark;
  border: 3px solid $darker;
}

.btn-info:hover {
  background-color: $light;
  border: 3px solid $dark;
}
//
// .btn-info:focus {
//   background-color: $lighter;
//   border: none;
//   outline: none !important;
//   box-shadow: none;
// }

.btn-info:not(:disabled):not(.disabled).active,
.btn-info:not(:disabled):not(.disabled):active,
.show>.btn-info.dropdown-toggle {
  background-color: $lighter;
  border: $light;
}

.line {
    width: 100%;
    height: 1px;
    border-bottom: 1px dashed #ddd;
    margin: 40px 0;
}

/* ---------------------------------------------------
    SIDEBAR STYLE
----------------------------------------------------- */

.wrapper {
    display: flex;
    flex-grow: 1;
    width: 100%;
}

#sidebar {
    width: 250px;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 999;
    background: $dark;
    color: #fff;
    transition: all 0.3s;
}

#sidebar.active {
    margin-left: -250px;
}

#sidebar .sidebar-header {
    padding: 20px;
    background: $dark;
}

#sidebar ul.components {
    padding: 20px 0;
    border-bottom: 1px solid $light;
}

.home-li {
  position: none;
  font-size: 1.2rem;
  padding: .3em .5em;
  margin-bottom: 0;
  background-color: $light;
  transition: all .7s ease-in-out;
}

.home-li:hover {
  background-color: $accent;
}

// .home-li:focus {
//   outline: none !important;
//   box-shadow: none !important;
//   background-color: $lighter;
// }

.product-title {
  font-family: 'Lato', sans-serif;
  font-weight: 100;
  margin: .5em 3.5em .5em .5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid $light;
}

#sidebar ul p {
    color: #fff;
}

#sidebar ul li a {
    padding: 10px;
    font-size: 1.1em;
    display: block;
}

#sidebar ul li a:hover {
    background: $light;
}

// #sidebar ul li a:focus {
//     background: $light;
//     outline: none;
//     box-shadow: none;
// }

#sidebar ul li.active>a,
a[aria-expanded="true"] {
    color: #fff;
}

a[data-toggle="collapse"] {
    position: relative;
}

#sidebar .widget-link {
  font-size: 1rem;
}

.dropdown-toggle::after {
    display: block;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
}

ul ul a {
    font-size: 0.9em !important;
    padding-left: 30px !important;
    background: $dark;
}

ul.CTAs {
    padding: 20px;
}

ul.CTAs a {
    text-align: center;
    font-size: 0.9em !important;
    display: block;
    border-radius: 5px;
    margin-bottom: 5px;
}

a.download {
    background: #fff;
    color: #7386D5;
}

a.article,
a.article:hover {
    background: $light !important;
    color: #fff !important;
}

#sidebar .CTAs {
  margin: 0 auto;
}

#sidebar .btn-li {
  display: flex;
  justify-content: center;
  margin: 0 auto;
  font-family: 'Lato', sans-serif;
  font-size: 1.2rem;
  background-color: $accent;
  border: 2px solid $light-accent;
  border-radius: 3px;
  width: 90%;
  transition: background-color .75s ease-in-out;
}

#sidebar .btn-li:hover {
  background-color: $light-accent;
}

#sidebar .website-link {
  color: white;
  font-weight: 100;
  transition: background-color .75s ease-in-out;
}

#sidebar .website-link:hover {
  background-color: transparent;
}

#sidebar .website-btn {
  background-color: transparent;
  border: none;
}

#sidebar .logo-li {
  display: flex;
  justify-content: center;
}

#sidebar .logo-img {
  width: 50px;
  height: 50px;
}

/* ---------------------------------------------------
    CONTENT STYLE
----------------------------------------------------- */

#content {
  width: calc(90% - 250px);
  padding: 5px;
  min-height: 100vh;
  transition: all 0.3s;
  position: absolute;
  top: 0;
  right: 0;
  @media (min-width: 768px) {
    width: calc(100% - 250px);
    padding: 15px;
    min-height: 100vh;
    transition: all 0.3s;
    position: absolute;
    top: 0;
    right: 0;
}
}

#content.active {
    width: 100%;
}

.city-state-btn,
.zipcode-btn,
.county-btn,
.time-zone-btn {
  padding-right: 1.5em;
}

.btn-group {
   margin-left: .5em;
}

.city-state-btn::after,
.zipcode-btn::after,
.county-btn::after,
.time-zone-btn::after {
  right: 10px;
}

.filter-list {
  display: flex;
  justify-content: center;
}

.filter-by {
  font-family: 'Open Sans', sans-serif;
  font-style: italic;
  margin-right: 1em;
}

input {
  margin: 0 .5em;
  padding-left: .5em;
  font-family: 'Lato', sans-serif;
  width: 245px;
}

.btn-control {
  font-family: 'Kulim Park', sans-serif;
  font-size: .9rem;
  background-color: #8ee6b5;
  border: 2px solid darken(#8ee6b5, 10%);
  border-radius: 2px;
  padding: .3em .5em;
}

.search-placeholder {
  margin: 0 auto;
}

.placeholder-img {
  display: flex;
  justify-content: center;
}

.placeholder-txt {
  display: flex;
  justify-content: center;
}

/* ---------------------------------------------------
    MEDIAQUERIES
----------------------------------------------------- */

@media (max-width: 768px) {
    #sidebar {
        margin-left: -250px;
    }
    #sidebar.active {
        margin-left: 0;
    }
    #content {
        width: 100%;
    }
    #content.active {
        width: calc(100% - 250px);
    }
    #sidebarCollapse span {
        display: none;
    }
}

/* ---------------------------------------------------
    WIDGETS
----------------------------------------------------- */

.widgets {
  margin-top: 10px;
}

.trivia-widgets,
.in-the-works-widgets {
  @media (min-width: 768px) {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-template-areas:
      "widget-1 widget-2"
      "widget-3 widget-4"
      "widget-5 widget-6";
  }
  @media (min-width: 1024px) {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    grid-template-areas:
      "widget-1 widget-2 widget-3"
      "widget-4 widget-5 widget-6"
  }
}

.widget {
  margin-bottom: 4em;
}

.widget-image {
  text-align: center;
}


iframe {
  border: none;
  display: block;
  margin: 0 auto;
  width: 300px;
  height: 350px;
}

body {
  background-color: transparent !important;
}

.weather-iframe,
.puzzle-iframe,
.in-the-works-iframe,
.games-iframe {
  margin-bottom: 1em;
}

.details {
  margin: 0 .5em;
  background-color: rgb(242, 240, 227);
  border-radius: 4px;
}

.details {
  padding: .5em 0 1em 0;
  margin-bottom: 4em;
}

.detail {
  padding: 0 1em;
  font-family: 'Lato', sans-serif;
  font-weight: 800;
  font-style: normal;
}

.span-detail {
  float: right;
  font-family: 'Lato', sans-serif;
  font-weight: 800;
  font-style: italic;
}

.footer-div {
  z-index: 2000;
}

footer {
  // margin: 0 auto;
  height: 20px;
  // max-width: 90%;
  background-color: $dark;
}

Answer 1

只有当您是小部件的作者时，您才能更改任何内容。

小部件所在的https://w1.predictinteractive.com/widgets/weather/index.html页面包含一个名为weather.min.js的JS文件。此文件可能包含一个同步XMLHTTPRequest，它将阻塞您的线程，如警告所示。

您最好使用更新的小部件，该小部件不使用同步XMLHTTPRequest来获取数据。或者，如果您觉得可以，使用众多开放天气API中的一个并构建您自己的小部件。

TL;DR除非您可以更改小部件的JS，否则无法修复它。