Firefox browser does not support innerText solution_javascript skills

<script> <br>window.onload = function(){ <br><PRE class=javascript name="code">if(window.navigator.userAgent.toLowerCase().indexOf(&quot;msie&quot;)==0){ //firefox innerText &lt;br&gt;HTMLElement.prototype.__defineGetter__( &quot;innerText&quot;, &lt;br&gt;function(){ &lt;br&gt;var anyString = &quot;&quot;; &lt;br&gt;var childS = this.childNodes; &lt;br&gt;for(var i=0; i&lt;childS.length; i ) { &lt;BR&gt;if(childS[i].nodeType==1) &lt;BR&gt;anyString = childS[i].tagName==&quot;BR&quot; ? 'n' : childS[i].textContent; &lt;BR&gt;else if(childS[i].nodeType==3) &lt;BR&gt;anyString = childS[i].nodeValue; &lt;BR&gt;} &lt;BR&gt;return anyString; &lt;BR&gt;} &lt;BR&gt;); &lt;BR&gt;HTMLElement.prototype.__defineSetter__( &quot;innerText&quot;, &lt;BR&gt;function(sText){ &lt;BR&gt;this.textContent=sText; &lt;BR&gt;} &lt;BR&gt;); &lt;BR&gt;};</PRE>var test = document.getElementById("test");<BR> <br>var innerText_s = test.innerText;<BR> <br>if( innerText_s == undefined ){<BR> <br>alert( test.textContent ); // firefox<BR> <br>}else{ <BR> <br>alert( test.innerText);<BR> <br>};<BR> <br><BR> <br><BR> <br>}<BR> <br><BR> <br><BR> <br></script>

html代码