?? ???? <script>?? ??? ??? ?window.onload = function() {?? ??? ??? ??? ?var oTab = document.getElementById("tab1");?? ??? ??? ??? ?for (var i=0;i<oTab.tBodies[0].rows.length;i++) {?? ??? ??? ??? ??? ?if (i%2==0) {?? ??? ??? ??? ??? ??? ?oTab.tBodies[0].rows[i].style.background="#ccc"?? ??? ??? ??? ??? ?} else{?? ??? ??? ??? ??? ??? ?oTab.tBodies[0].rows[i].style.background=""?? ??? ??? ??? ??? ?}?? ??? ??? ??? ?}?? ??? ??? ?}?? ??? ??? ??? ??? ??? ?function btn1() {?? ??? ??? ??? ?var oTab = document.getElementById("tab1");?? ??? ??? ??? ?var otd = oTab.tBodies[0].rows[0].cells[0];?? ??? ??? ??? ??? ?alert(otd.innerHTML);?? ??? ??? ??? ?}?? ??? ?</script>var otd = oTab.tBodies[0].rows[0].cells[0];這句話如果定義在onload中的話引用btn1（）時會提示otd未定義，能不能有什么簡單的辦法不用再函數中重新獲取，而是一次性一起獲取。