function clearText() {
? var content=document.getElementById("content");
? // 在此完成該函數(shù)
? var x = content.childNodes;
? for(var i=x.length; i>0; i--) {
????? if(x[i].nodeType!=1) {
????????? continue;
????? } else {
????????? content.removeChild(x[i]);
????? }
??? document.write("刪除節(jié)點(diǎn)的內(nèi)容：" + x.innerHTML);
? }