复选框
<!doctype html>
<html>
<head>
<meta charset="gb2312">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>复选框多选</title>
</head>
<body>
<div>
<input type="checkbox" value="1"/><span>红色</span>
<input type="checkbox" value="2"/><span>绿色</span>
<input type="checkbox" value="3"/><span>黄色</span>
<input type="checkbox" value="4"/><span>蓝色</span>
<input type="checkbox" value="5"/><span>紫色</span>
</div>
<div>
<button type="button" onclick="getValue()">获取选中的复选框的值</button>
</div>
<div>
<p id="show"></p>
</div>
<script>
function getValue()
{
//获取所有的input标签
var input = document.getElementsByTagName("input");
var str="选中的值为:";
for (var i = 0; i < input.length; i++)
{
var obj = input[i];
//判断是否是checkbox并且已经选中
if (obj.type == "checkbox" && obj.checked)
{
var code = obj.value;//获取checkbox的值
str=str+code+",";
}
}
document.getElementById("show").innerText=str;
}
</script>
</body>
</html>