How does a file with Chinese characters know how many bytes to use per character?

Question

I have read Joel\'s article \"The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)\" but still don\'

Answer 1

why there are so many complicated answers?

3 bytes for 1 Chinese character. using this function( under jQuery) :

function get_length(field_selector) {
  var escapedStr = encodeURI($(field_selector).val())
  if (escapedStr.indexOf("%") != -1) {
    var count = escapedStr.split("%").length - 1
    if (count == 0) count++  //perverse case; can't happen with real UTF-8
    var tmp = escapedStr.length - (count * 3)
    count = count + tmp
  } else {
    count = escapedStr.length
  }
  return count
}