How to save a file locally using jsPDF?

Question

JavaScript

var doc = new jsPDF({
      orientation: 'landscape',
      unit: 'in',
      format: [4, 2]
    })

    doc.text('Hello world!', 1, 1)
    doc.save('two-by-four.pdf')

this is my code, in general it is copied from the docks (I wanted to see how the package works)

When you save, the "save as" menu opens in the application. I just need to save the document locally. Please tell me how.