page load时执行JavaScript

    // Multiple onload function created by: Simon Willison
    // http://simonwillison.net/2004/May/26/addLoadEvent/
    function addLoadEvent(func) {
      var oldonload = window.onload;
      if (typeof window.onload != 'function') {
        window.onload = func;
      } else {
        window.onload = function() {
          if (oldonload) {
            oldonload();
          }
          func();
        }
      }
    }

    addLoadEvent(function() {
      /* more code to run on page load */
    });