getElementByIdx_x js自定义getElementById函数

  函数代码:

  

复制代码 代码如下:

  document.getElementByIdx_x=function(id){

  if(typeof id =='string')

  return document.getElementById(id);

  else

  throw new error('please pass a string as a id!')

  }

  实例代码:

  

复制代码 代码如下:

  <div id='box'>9</div>

  <script>

  document.getElementByIdx_x=function(id){

  if(typeof id =='string')

  return document.getElementById(id);

  else

  throw new error('please pass a string as a id!')

  }

  var timer = window.setInterval(function(){

  document.getElementByIdx_x('box').innerHTML = parseInt(document.getElementByIdx_x('box').innerHTML) - 1;

  if(parseInt(document.getElementByIdx_x('box').innerHTML) < 0)

  {

  window.clearInterval(timer);

  window.location = 'http://www.glzy8.com';

  }

  }, 1000);

  </script>