分享程序员开发的那些事...
更新时间：2023-11-10 09:23:52
我使用三元运算符：
data = "<html>\n"
+ "<head>\n"
+ ( typeof metadata_title !== "undefined" ? "<title>" + metadata_title + "</title>\n" : "" )
+ ( typeof metadata_author !== "undefined" ? "<meta name=\"author\" content=\"" + metadata_author + "\"></meta>\n" : "" )
+ ( typeof metadata_date !== "undefined" ? "<meta name=\"date\" content=\"" + metadata_date + "\"></meta>\n" : "" )
+ "</head>\n"
+ "<body>\n"
+ "\n"
+ paras.join("\n\n")
+ "\n"
+ "\n"
+ "</body>\n"
+ "</html>"
;