如何在包装盒中显示颜色

Question

下面有什么脚本错误？

var color = ["black","gray","silver","white","yellow","orange","red","brown","pink","purple","blue","aqua","green","lime","olive","navy","teal"];
for(a=0; a<color.length; a++){
    document.write("<li><a href='#' class='color' id='"+color[a]+"'></a></li>");

问题，在一个框中没有出现颜色。

如何在包装盒中显示颜色？