<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
</head>
<body>
<div id="pardom">
<span id="firsubdom">子节点一</span>
<span id="secsubdom">子节点二</span>
</div>
<script type="text/javascript">
var getdomindex = function(el) {
if (!el) {
return -1;
}
var i = 0;
while ((el = el.previousElementSibling)) {
i++;
}
return i;
};
var emptysubdom = function(el) {
while (el.firstChild) {
el.removeChild(el.firstChild);
}
};
console.log(getdomindex(document.getElementById("secsubdom")));
emptysubdom(document.getElementById("pardom"));
</script>
</body>
</html>
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