A.var_變量=NaN; B.var0bj=[]; C.varobj=//; D.varobj={};
A.window對(duì)象是瀏覽器模型的頂層對(duì)象 B.document代表整個(gè)HTML文檔 C.location對(duì)象的forward方法可以實(shí)現(xiàn)瀏覽器的前進(jìn)功能 D.history對(duì)象用來管理當(dāng)前窗口最近訪問過的URL
A.insertBefore B.appendChild C.removeChild D.deleteChild