var subcat = new Array();subcat[0]=new Array("1","密云縣","51");subcat[1]=new Array("1","延慶縣","52");subcat[2]=new Array("2","上海市所有地區(qū)","2");subcat[3]=new Array("2","黃浦區(qū)","53");subcat[4]=new Array("2","盧灣區(qū)","54");……省略的代碼……var city = document.getElementById("AID");for(i = 0; i < subcat.length; i++){?if (subcat[i][0] == "2") city.options[city.length] = new Option(subcat[i][1], subcat[i][2]);} 求助：上面紅色部分的代碼用jQuery寫的話，要怎么寫呢？謝謝！