修改原型链/Node2无侵入

    /*修改Node的原型链*/
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
    <ul>
      <li id="item1">选项1</li>
      <li id="item2">选项2</li>
      <li id="item3">选项3</li>
      <li id="item4">选项4</li>
      <li id="item5">选项5</li>
  </ul>
</body>
</html>
 ------------------------------------------------------------
  /*修改Node的原型链*/

Node.prototype.getSiblings = function(){
var allChildren  = this.parentNode.children
var array  = {
length:0
}
 for(let i = 0 ;i<allChildren.length; i++){
      if(allChildren[i] !== this){
        array[array.length] = allChildren[i]
        array.length += 1
  
      }
  }
  return array
}


Node.prototype.addClass = function(classes){
  for(let key in classes){
    var value = classes[key]
    var methodName = value ? 'add' : 'remove'
        this.classList[methodName](key)
  }
}
console.dir(item3)
console.log(item3)
console.log(item3.getSiblings())
console.log(item3.addClass({'a':true,'b':true,'c':true}))
console.log(item3.getSiblings.call(item3))
console.log(item3.addClass.call(item3,{'a':true,'b':true,'c':true}))

------------------------------------------------------------------------------






 -----------------------Node2[无侵入]---------------------------------------
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<ul>
  <li id="item1">选项1</li>
  <li id="item2">选项2</li>
  <li id="item3">选项3</li>
  <li id="item4">选项4</li>
  <li id="item5">选项5</li>
</ul>
</body>
</html>
----------------------------------------------------------------------------
window.Node2 = function(node){
  return{
getSiblings:function(){
   var allChildren  = node.parentNode.children
   var array  = {
      length:0
   }
  for(let i = 0 ;i<allChildren.length; i++){
      if(allChildren[i] !== node){
        array[array.length] = allChildren[i]
        array.length += 1
  
      }
  }
  return array
},
addClass:function(classes){
  for(let key in classes){
  var value = classes[key]
  var methodName = value ? 'add' : 'remove'
      node.classList[methodName](key)
  }
}
}
  }

var node2 = Node2(item3)
console.log(Node2)
console.log(node2)
console.log(node2.getSiblings())

node2.addClass({'a':true,'b':true,'c':true})
console.log(item3)
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