how to read a text file by lines with d3.js (like readlines in python)

Question

I want to plot a picture with D3. The data is from text file like this: a.txt:

1 200
2 300
3 220

I try to read the file in this way

    d3.text("850191387_full_info.txt",function(error,data)
{
  if(error)
    return console.error(error);
  d3.select("body")
    .append("p")
    .text(data);
});  

But it can only appear the whole data in web page. How can I plot a simple line chart with this txt file? the first column as x variable, and the second column as y variable