小知识点(JS)

阻止事件冒泡

if(event.stopPropagation){
  event.stopPropagation();  //标准模型    
}else{
  event.cancelBubble = true;  //IE
}

阻止元素默认操作

if(event.preventDefault){
  event.preventDefault;  //标准模型
}else{
  event.returnValue = false;  //IE
}

键盘值

//传统的keydown事件对象的keyCode属性是不标准的
    //但下面的值似乎可以在大多数浏览器和OS中可行
    Keymap.keyCodeToKeyName = {
      //使用词或方向键的按键
      8:"Backspace",9:"Tab",13:"Enter",16:"Shift",17:"Control",18:"Alt",
      19:"Pause",20:"CapsLock",27:"Esc",32:"Spacebar",33:"PageUp",
      34:"PageDown",35:"End",36:"Home",37:"Left",38:"Up",39:"Right",

      //主键盘(非数字小键盘)上的数字
      48:"0",49:"1",50:"2",51:"3",52:"4",53:"5",54:"6",55:"7",56:"8",57:"9",

      //字母键盘，注意我们不区分大小写
      65:"A",66:"B",67:"C",68:"D",69:"E",70:"F",71:"G",72:"H",73:"I",74:"J",
      75:"K",76:"L",77:"M",78:"N",79:"O",80:"P",81:"Q",82:"R",83:"S",84:"T",
      85:"U",86:"V",87:"W",88:"X",89:"Y",90:"Z",

      //数字小键盘的数字和标点符号按键(Opera不支持这些)
      96:"0",97:"1",98:"2",99:"3",100:"4",101:"5",102:"6",103:"7",104:"8",105:"9",
      106:"Multiply",107:"Add",109:"Substract",110:"Decimal",111:"Divide",

      //功能键  F13 - F24 === shift+F1 - shift+F12
      112:"F1",113:"F2",114:"F3",115:"F4",116:"F5",117:"F6",
      118:"F7",119:"F8",120:"F9",121:"F10",122:"F11",123:"F12",
      124:"F13",125:"F14",126:"F15",127:"F16",128:"F17",129:"F18",
      130:"F19",131:"F20",132:"F21",133:"F22",134:"F23",135:"F24",

      //不需要按下Shift键的标点符号键
      //连字符不兼容，FF返回的编码和减号一样
      59:";",61:"=",186:";",187:"=",  // Firefox 和 Opera返回59,61
      188:",",190:".",191:"/",192:"`",219:"[",220:"\",221:"]",222:"'"
    }

 页面重新加载的几种方法

 history.go(0) 
 location.reload() 
 location=location 
 location.assign(location) 
 document.execCommand('Refresh') 
 window.navigate(location) 
 location.replace(location) 
 document.URL=location.href