反斜线转义和html转义区别？

Question

  var txt="We are the so-called \"Vikings\" from the north."
  var txt2="We are the so-called "Vikings" from the north."
  document.write(txt2)

上面两种效果一样，那这两种有什么区别？

Answer 1

把第一个字符串插入到HTML中时，插入的实际字符串是

We are the so-called "Vikings" from the north.

反斜杠被JavaScript转义

第二个插入的是

We are the so-called "Vikings" from the north.

在显示的时候浏览器会转义第二个字符串中的"

Answer 2

第一种后端可能会当作转义字符再次处理，第二种好