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<html>
<head>
<title></title>
</head>
<body>
<span id="sp">A<span>123</span></span>
<script type="text/javascript" language="javascript">
window.onload=function(){
var span=document.getElementById("sp");
alert(span.firstChild.nodeValue);
}
</script>
</body>
</html>
$(".content")[0].firstChild.data;
$('.content').contents("[nodeType=3]").text();
$('.content span').text()
$(function(){
var html = $(".content").html();
var val = html.substring(0, html.indexOf("<"));
alert(val);
})
$(".content").text().replace($(".content").children().text(),'');