css中tabletr:nth-child(even)改变tr背景颜色：IE7,8无效_html/css

.my_table tr:nth-child(even){background:#E6EDF5;}.my_table tr:nth-child(odd){background:#F0F5FA;}

.table_border table tr.even{background: #f8f8fb;}

 $(".nav ul li div a:nth-child(even)").css({'background':'red'});$(".nav ul li div a:nth-child(odd)").css({'background':'grey'});

tr {background-color:expression((this.sectionRowIndex%2==0)?"red":"blue")}td {background-color:expression((this.cellIndex%2==0)?"":((this.parentElement.sectionRowIndex%2==0)?"green":"yellow"))}