Operations on nodes by js and jquery

<Script src = "jquery-1.9.1.js" type = "text/javascript"> </script> <script type = "text/javascript"> $ (function () {$ ('# Button1 '). click (function () {// var ha = '<p> a </p>'; // $ ('div '). append (ha); // 1 // var w = '<a href = "#"> f4 </a>' // $ ('div '). append (w ); // var sele = '<select> <option> 1 </option> <option> 2 </option> <option> 3 </option> </select> '// $ ('div '). append (sele );})}) // 2var pstr = '<p> <B> <I> the Yellow River enters the ocean </br> to reach the next level </br>/ i> </B> </p> '; $ ('div '). append (pstr); change it to js for writing. function ha () {// var p = document. createElement ('P'); // var B = document. createElement ('B'); // var I = document. createElement ('I'); // var neirong1 = document. createTextNode ('day by day '); // var br1 = document. createElement ('br ') // var neirong2 = document. createTextNode ('Yellow River currents '); // var br2 = document. createElement ('br ') // var neirong3 = document. createTextNode ('thousands of miles away '); // var br3 = document. createElement ('br ') // var neirong4 = document. createTextNode ('upgrade'); // I. appendChild (neirong1); // I. appendChild (br1); // I. appendChild (neirong2); // I. appendChild (br2); // I. appendChild (neirong3); // I. appendChild (br3); // I. appendChild (neirong4); // B. appendChild (I); // p. appendChild (B); // document. getElementById ('div1 '). appendChild (p );} </script>