javascript - Jquery TypeWriter Effect variable change -

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i'm attempting create jquery typewriter effect scrolls through different sentences each 10 seconds. @ 10 second break style of site changes. problem after first run through sentences turn gibberish variable 'text_number' keeps getting changed , i'm not sure why.

any appreciated.

var textone = '"hello world"';  var texttwo = '"what happening"';  var textthree = 'good morning';      function text_change(text_number) {    if (text_number === 1) {      var splittext = textone.split("");    } else if (text_number === 2) {      var splittext = texttwo.split("");    } else if (text_number === 3) {      var splittext = textthree.split("");    }        var n = splittext.length;      function text_animation(textpos) {        var previousi = textpos - 1;      var nextletter = splittext.slice(previousi, textpos);        if (nextletter == '*') {        $("#quote-div p").append("<br>");      } else {        $("#quote-div p").append(nextletter);      }      }        = 0;    setinterval(function() {      i++;      if (i <= n) {        text_animation(i);      }    }, 0200);    }        var site = 1;    //animate site function  function animate_site(site_number) {    if (site_number == 1) {      //extra css site changes      $("#quote-div p").empty();      text_change(site_number);    } else if (site_number == 2) {      //extra css site changes      $("#quote-div p").empty();      text_change(site_number);    } else if (site_number == 3) {      //extra css site style change each 10 seconds      $("#quote-div p").empty();      text_change(site_number);      site = 0;    }  }    function animate_site_loop() {      setinterval(function() {      site++;      animate_site(site);    }, 10000);  }    $(document).ready(function() {    animate_site_loop();    text_change(site);  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>  <div id="quote-div">    <p></p>  </div>


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