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<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>無(wú)標(biāo)題文檔</title> <div id="demo"> <div>點(diǎn)擊這里進(jìn)行克隆</div> <div>節(jié)點(diǎn)</div> <div>節(jié)點(diǎn)</div> </div> <script type="text/javascript"> document.getElementById("demo").onclick=function(){ alert(this.cloneNode(true).children.length); } </script> </head> <body> </body> </html>