Ruby 数组转换成 Javascript 参数
有的时候数据存储在 Ruby 的数组里，如果你想把这个数组当作 Javascript 的函数的参数，比如：
@names = ['Zhangsan','Lisi']
你想把他作为参数传给 Javascript 代码，达到这样的效果：
a_js_function(['Zhangsan','Lisi']);
需要把 @names 转换成字符串的表达形式，你可能想到迭代数组中的每项，拼出最终的字符串，其实简单的方法是 inspect：
a_js_function(<%= @name.inspect %>);
因为在 Ruby 和 Javascript 中数组的表达是基本一样的，所以这样刚好达到了要求。
不过如果数组中有不期望的数据，比如 nil 或者一个复杂的对象什么的，结果可能就不是你希望的了。那么可以试试 array_or_string_for_javascript：
a_js_function(<%= array_or_string_for_javascript(@names) %>);
不过，array_or_string_for_javascript 会把数组中所有的项目都转换成字符串，所以如果数组是 [100, 200, 300] 就会被转换成 ['100', '200', '300'] 如果你想传入数值的话就用前面的 inspect 了。
另外还有一个 options_for_javascript，把 Ruby 的 Hash 转成 Javascript 的格式：
<%= options_for_javascript(:a => 1, :b => 2, :c => 3) %>
=> {a:1, b:2, c:3}
=> {a:1, b:2, c:3}
Rails 中的 Helper 也用这俩函数生成 Javascript 的参数。
inspect 只适合偷懒用，毕竟 inspect 的格式并不保证不会变，也许 Ruby 下一般换个更漂亮的方式显示 inspect 结果，这招就不灵了。
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