html - Not able to access next element of an array javascript -

i new js, trying access next element of array using onclick function no luck.

var i, len;                function quiz() {      var quiz_questions = [      "who founder of facebook?",      "who founder of google?"      ];                    len = quiz_questions.length;        for(i = 0; < len; i++) {      document.getelementbyid("demo").innerhtml = quiz_questions[i];      }  }

<button onclick="quiz();">click</button>  <p id="demo"></p>

can explain me did wrong here.

your problem is, iterate through every question, every time click. remove loop , put i++ after setting question. maybe checking, if less array length before it, wouldnt bad idea.

var i, len;  = 0;                function quiz() {      var quiz_questions = [      "who founder of facebook?",      "who founder of google?"      ];                    len = quiz_questions.length;        document.getelementbyid("demo").innerhtml = quiz_questions[i];      i++;      if(i>=len){        i=0;      }  }

<button onclick="quiz();">click</button>  <p id="demo"></p>