javascript 监听回车(Enter)事件

监听整个文档的 Key up 事件，判断回车

1. jquery

$(document).keyup(function(e){
  var key = e.which;
  if(key==13){
    /*Do something. 调用一些方法*/
  }
});

2. javascript

document.onkeyup = function(e) {
  // 兼容FF和IE和Opera
  var event = e || window.event;
  var key = event.which || event.keyCode || event.charCode;
  if (key == 13) {
    /*Do something. 调用一些方法*/ 
  }
};