分析下面的Javascript代碼段,輸出結(jié)果是() var mystring=”I am a student”; var a=mystring.substring(9,13); document.write(a);
A.stud B.tuden C.uden D.udent
A.<input name=”mybutton” type=”button” onBlur=”compute()”value=”計(jì)算”> B.<input name=”mybutton” type=”button” onFocus=”compute()”value=”計(jì)算”> C.<input name=”mybutton” type=”button” onClick=”function compute()”value=”計(jì)算”> D.<input name=”mybutton” type=”button” onClick=”compute()”value=”計(jì)算”>
A.history對(duì)象記錄了用戶在一個(gè)瀏覽器中已經(jīng)訪問過的URLs B.location對(duì)象相當(dāng)于IE瀏覽器中的地址欄,包含關(guān)于當(dāng)前URL地址的信息 C.location對(duì)象是history對(duì)象的父對(duì)象 D.location對(duì)象是window對(duì)象的子對(duì)象