在javascript中从字符串变量创建正则表达式

var tags=["div","span","body"];
for (i=0; i<=tags.length; i++){
  source = source.replace(/\&lt\;<tags[i]/i, '<span class="tags[i]">&lt;tags[i]</span>');
}
var tags=["div","span","body"];
for (i=0; i<=ta