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关于按下按钮等event的控制

    //得到窗口的event对象    event = window.event;    //得到event对象的控件    target = event.srcElement;

代表作:

  document.onkeydown = function(event)  {    var target, code, tag;    if (!event)    {      event = window.event;      target = event.srcElement;      code = event.keyCode;      if (code == 13)      {        tag = target.tagName;        if (tag == "TEXTAREA")        {          return true;        }        else        {          return false;        }      }    }    else    {      target = event.target;      code = event.keyCode;      if (code == 13)      {        tag = target.tagName;        if (tag == "INPUT")        {          return false;        }        else        {          return true;        }      }    }