javascript - 如何使用javascript在链接href中插入变量值？

Question

只是想问一下如何在href中添加变量？ 例如，这是我的 javascript:

    <script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
    $( document ).ready(function() {
        function setLinkValue(value) {
            var numItems = $('[id^=site-]').length;

            for (i = 0; i < numItems; i++) { 
                var link = document.getElementsByClassName('site-link');
                link.href = link.href.replace('putNatsvarHere', value);
            }

        }

        //You would pass netsvar here
        setLinkValue('ExampleValue');

    });
</script>

我想将其插入到 href 中的 a 标记中

<a href="http://websitelink.com/track/putNatsvarHere/pt?thumb_id=302&gn=pt&gi=01.jpg" id="site-link" class="title" target="_self">Exclusive February Sale!</a><br>

    <a href="http://websitelink.com/track/putNatsvarHere/pt?thumb_id=302&gn=pt&gi=01.jpg" id="site-link" class="title-link" target="_self">Sale!</a>
    <br>
    <a href="http://websitelink.com/track/putNatsvarHere/pt?thumb_id=302&gn=pt&gi=01.jpg" id="site-link" class="title-link pink-play" target="_self"> February Sale!</a>

Answer 1

您只需将 URL 中的某个段替换为值即可，甚至不需要 jQuery 来完成此操作。请参阅下面的工作示例。

function setLinkValue(value) {
  var link = document.getElementById('site-link');
  
  link.href = link.href.replace('putNatsvarHere', value);
}

//You would pass netsvar here
setLinkValue('ExampleValue');

<a href="http://websitelink.com/track/putNatsvarHere/pt?thumb_id=302&gn=pt&gi=01.jpg" id="site-link" class="title-link pink-play" target="_self">Exclusive February Sale!</a>

您可以通过以下方式调用setLinkValue:

var natsvar = getCookie("nats");
setLinkValue(natsvar);

要更新多个元素，您可以使用 getElementsByClassName 并循环遍历它们。

function setLinkValue(link, value) {
  link.href = link.href.replace('putNatsvarHere', value);
}

var elements = document.getElementsByClassName('title-link');
var i = 0;

for (i = 0; i < elements.length; i++) {
  //You would pass netsvar here
  setLinkValue(elements[i], 'ExampleValue');
}

<a href="http://websitelink.com/track/putNatsvarHere/pt?thumb_id=302&gn=pt&gi=01.jpg" class="title-link pink-play" target="_self">Exclusive February Sale!</a>
<a href="http://example.com/putNatsvarHere/" class="title-link pink-play" target="_self">Another link</a>