javascript - 使用 javascript 迭代跨度

Question

仅使用 Javascript，如何迭代每个跨度 id = "expiredDate"？我认为使用 foreach 循环这会很容易，但它似乎不存在于 javascript 中。我的下面的代码仅适用于第一个元素。

<script type="text/javascript">
window.onload = function() {
    var definedDate = window.document.getElementById('expiredDate').innerHTML.split("-");
    var expiredDate = new Date(definedDate[0], definedDate[1] - 1, definedDate[2]);
    var graceDate = new Date(definedDate[0], definedDate[1] - 1, definedDate[2] - 30);
    var currentDate = new Date();

    if(currentDate > expiredDate) {document.getElementById('expiredDate').style.color = '#cc6666';}
    else if(currentDate < expiredDate && currentDate > graceDate) {document.getElementById('expiredDate').style.color = '#f0c674';}
    else {document.getElementById('expiredDate').style.color = '#b5bd68';}
}
</script>
<span id="expiredDate">2013-01-01</span>
<span id="expiredDate">2014-01-01</span>
<span id="expiredDate">2015-01-01</span>

Answer 1

将您的 ID 切换到类(class)并尝试以下操作

var spans = document.getElementsByTagName('span');
var l = spans.length;
for (var i=0;i<l;i++) {
    var spanClass = spans[i].getAttribute("class"); 
    if ( spanClass === "expiredDate" ) { 
        /*do stuff to current spans[i] here*/
    }
}