$("#GridView1 tr td:last-child").each(function ()
{
var width = $(document).width() - 700.0;
var html = $(this).html()//获取内容
$(this).html("<div style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word; table-layout: fixed ">" + html + "</div>").width(width);//添加div并设置样式和宽度
});