您可以将这段代码格式调整为字符串形式，并使用加号连接起来，最后赋值给fan_5u_html变量。下面是修改后的示例：
var fan_5u_html = "<tr>" +
"<td id='view_txt84' style=\"width: 106px;\"></td>" +
"<th style=\"width:390px;border: 1px solid #999; padding: 0px 5px; text-align: left;\" class=\"fan1_run_status_1\" colspan='2'></th>" +
"</tr>" +
"<tr>" +
"<td id='view_txt62'></td>" +
"<td class=\"fan1_speed1\" colspan='2'></td>" +
"</tr>" +
"<tr>" +
"<td id='view_txt85'></td>" +
"<td class=\"fan1_run_status_2\" colspan='2'></td>" +
"</tr>" +
"<tr>" +
"<td id='view_txt66'></td>" +
"<td class=\"fan1_speed2\" colspan='2'></td>" +
"</tr>" +
"<tr>" +
"<td id='view_txt120'></td> <" +
"select class=\"fan1_ctl_speed \" style=\"width: 100%;\"><option id='view_txt122' selected=\"selected\" value=0>低速</option><option id='view_txt123' value=1>中速</option><option id='view_txt124' value=2>高速</option></select></t" +
"d><" +
"button style=\"margin-left: 6px;margin-top: -3px;\" class=\'ols_fan1_ctl_speed\' id=\'view_txt79\' value=\"设置\"></button></t" +
"d>" +
"</tr>";
注意，字符串中包含引号时需要进行转义处理，添加反斜杠 \ 来转义。这样您就可以正确地将代码段连接起来并赋值给 fan_5u_html 变量了。
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