javascript的语法

输出的结果：<script language=javascript>
document.getElementById('log').innerHTML = '<span style='font-size: 10pt; font-family: 黑体'>欢迎 建军节jj！<br /></span><div style='width: 100px; height: 18px; margin-top:30px' id='btlog'><asp:Button ID='Button2' runat='server' Text='退出' Height='21px' Font-Size='X-Small' Width='63px' OnClick='Button2_Click'/>';
document.getElementById('log').style.backgroundImage='';
</script>简单的说单引号里放单引号。'<span style='font-size: 10pt; font-family: 黑体'>...'建议这样：
str1 = "<script language=javascript>document.getElementById('log').innerHTML = \"<span style='font-size: 10pt; font-family: 黑体'>欢迎 建军节jj！<br /></span><div style='width: 100px; height: 18px; margin-top:30px' id='btlog'><asp:Button ID='Button2' runat='server' Text='退出' Height='21px' Font-Size='X-Small' Width='63px' OnClick='Button2_Click'/>\";document.getElementById('log').style.backgroundImage='';</script>";