如果变量 get 则删除类

Question

如果有变量get(SID(，则需要删除现有类(forceview(

网址示例：https://example.com/?SID=eqwe7q7e6868

我正在获取变量并尝试插入显示(无(。

function sid() {
// Gets a url that includes the `?` character
var url = "somedomain.net?search";
if (url.indexOf("?") > 0) {
// Selects elements with the "forceview" class
const forceviews = document.getElementsByClassName("forceview");
// Loops through these elements and removes them from display
for (let forceview of forceviews){
forceview.style.display = "none";
}
console.log("all `.forceview` elements have been hidden");
}
}
sid();

span.old-price.sly-old-price.no-display.forceview {
display: inline !important;
}

<span class="old-price sly-old-price no-display forceview">
<span class="price-container price-final_price tax weee">
<span class="price-label">Preço Normal
</span>
<span id="old-price-1263-final_price" data-price-amount="19.9" data-price-type="oldPrice" class="price-wrapper ">
<span class="price">R$19,90</span>
</span>
</span>
</span>

代码不返回任何错误。

Answer 1

这是你想做的吗？

function sid() {
// Gets a url that includes the `?` character
var url = "somedomain.net?search";
if (url.indexOf("?") > 0) {
// Selects elements with the "forceview" class
const forceviews = document.getElementsByClassName("forceview");
// Loops through these elements and removes them from display
for (let forceview of forceviews){
forceview.style.display = "none";
}
console.log("all `.forceview` elements have been hidden");
}
}
sid();

<span class="old-price sly-old-price no-display forceview">
<span class="price-container price-final_price tax weee">
<span class="price-label">Preço Normal
</span>
<span id="old-price-1263-final_price" data-price-amount="19.9" data-price-type="oldPrice" class="price-wrapper ">
<span class="price">R$19,90</span>
</span>
</span>
</span>

Answer 2

document.getElementsByClassName(( 不接受 css 选择器。 你应该写

document.getElementsByClassName("forceview")[0]

[0] 因为 document.getElementsByClassName 返回一个数组 元素。

Answer 3

我看到很多错误：

• 您应该在函数外部(而不是内部(运行函数。

•您尝试与getElementById一起上课，我认为您应该使用getElementsByClassName。

• 你正在循环spans.length但什么是跨度？ 你不会在任何地方声明它。