原生js实现简单的链式操作

var area = document.querySelector('.area');
area.addEventListener('mouseenter', function(){
 console.log( 'mouse enter' );
});
area.addEventListener('click', function(){
 console.log( 'click' );
});

;(function(){
 window.G = function(selector){
 return new _G(selector);
 }
 function _G(selector){
 this.elements = document.querySelector(selector);
    return this;
 }
 _G.prototype = {
 constructor : _G,
 method : function(name, fn){
  if(this.elements){
  this.elements.addEventListener(name, fn, false);
  }
  return this;
 }
 }
})();

G('.area').method('mouseenter', function(){
  console.log( 'mouse enter' );
}).method('click', function(){
  console.log( 'click' );
})

 _G.prototype = {
 constructor : _G,
 method : function(name, fn){
 if(this.elements){
  this.elements.addEventListener(name, fn, false);
 }
 return this;
 },
 show : function(){
 this.elements.style.display='';
 return this;
 },
 hide : function(){
 this.elements.style.display='none';
 return this;
 }
}

// 隐藏
G('.area').hide();

// 显示并且绑定click事件
G('.area').show().method('click', function(){
 console.log( Date.now() );
})

G('.area').style.display='none'; // 错误

G('.area').elements.style.display='none'; // 正确