js获取标签内容和输出内容到页面
获取：
html:
<select id="choiceSelect" onchange="changeImg()"> <option value="1">石头</option> <option value="2">剪刀</option> <option value="3">布</option> </select>
<img src="img/1.png" id="img1">
js:
<script type="text/javascript">
var n1 = 1;function changeImg(){
var changeImg = document.getElementById("choiceSelect");
n1 = changeImg.value;
// alert(n1);
document.getElementById("img1").src="img/"+n1+".png";
}</script>
输出：
html: <p id = "finalresult"></p>
js: document.getElementById("finalresult").innerHTML = "输出的内容";
原文：https://www.cnblogs.com/makangning/p/9373948.html