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[英]how to remove and create new ul li tag in html using javascript
[英]How to create element li img tag in ul tag using javascript?
如何使用javascript在ul标签中创建li li img标签元素?
我要建立
<li id="123">
<img src="https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif"/>
</li>
内
<ul id="placehere">
但是不行,我该怎么办?
https://jsfiddle.net/btz69dyk/2/
<body>
<script type="text/javascript">
window.onload=function(){
var elem = document.createElement("li");
elem.setAttribute("id", "123");
var elem = document.createElement("img");
elem.setAttribute("src", "https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif");
elem.setAttribute("height", "");
elem.setAttribute("width", "");
elem.setAttribute("alt", "Flower");
document.getElementById("placehere").appendChild(elem);
}
</script>
<ul id="placehere">
</ul>
</body>
问题是这四行
var elem = document.createElement("li");
elem.setAttribute("id", "123");
var elem = document.createElement("img");
elem.setAttribute("src", "https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif");
在这里,您将使用相同的变量名再次创建相同的elem
元素,从而使li
丢失
更改为
var elem1 = document.createElement("li");
elem1.setAttribute("id", "123");
var elem = document.createElement("img");
elem.setAttribute("src", "https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif");
elem.setAttribute("height", "");
elem.setAttribute("width", "");
elem.setAttribute("alt", "Flower");
document.getElementById("placehere").appendChild(elem1);
elem1.appendChild(elem);
首先将
image
元素附加到li
元素,然后在ul
元素中附加li
元素。
在您的示例中,您正在同一变量( elem
)中创建元素,因此第二个元素将覆盖先前创建的元素(变量将包含后面的元素)。 在DOM
更新image
元素之前将其添加到li
元素中,只会对DOM
结构造成一次麻烦。
尝试这个:
window.onload = function() { var li_elem = document.createElement("li"); li_elem.setAttribute("id", "123"); var img_elem = document.createElement("img"); img_elem.setAttribute("src", "https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif"); img_elem.setAttribute("height", ""); img_elem.setAttribute("width", ""); img_elem.setAttribute("alt", "Flower"); li_elem.appendChild(img_elem); document.getElementById("placehere").appendChild(li_elem); }
<ul id="placehere"> </ul>
var listEle = document.createElement("li"); listEle.setAttribute("id", "123"); var elem = document.createElement("img"); elem.setAttribute("src", "https://upload.wikimedia.org/wikipedia/commons/5/53/Loading_bar.gif"); elem.setAttribute("height", ""); elem.setAttribute("width", ""); elem.setAttribute("alt", "Flower"); document.getElementById("placehere").appendChild(listEle).appendChild(elem);
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