Question

这是raislcasts.com complex-form-examples中关于动态地将字段添加到表单的函数。该函数使用rails 3.1.3和jquery运行。

  def link_to_add_fields(name, f, association)
    new_object = f.object.class.reflect_on_association(association).klass.new
    fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
      render(association.to_s.singularize + "_fields", :f => builder)
    end
    link_to_function(name, "add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")")
  end

该协会是一个象征，必须是。这\"...\" #{..}的目的是什么？删除它会导致错误。

Answer 1

目的是转义出现在相同类型的引号字符内的引号字符，以确保字符串不以此字符结尾

适当使用的示例

"This is a \"quote\""
=> This is a "quote"

'This is a \'quote\''
=> This is a 'quote'

"This is a 'quote'"
=> This is a 'quote'    

'This is a "quote"'
=> This is a "quote"

Answer 2

反斜杠用于转义双引号。这样你就可以在字符串中使用任意数量的双引号（以反斜杠为前缀）......

前：

var test = "Bobby said "Hello!" to the crowd."; 
-> will give you an syntax error 

var test = "Bobby said \"Hello!\" to the crowd."; 
-> double quote for (Hello!) is escaped using backslash

什么是反斜杠\“... \”在rails 3.1.0和jquery中做了什么？

2 个答案: