es6

decorators@@@@

npm install --save-dev babel-plugin-transform-decorators

{
  "plugins": ["transform-decorators"]
}

es6

var cc=console;
// var a=[{key:0,name:'apple'},{key:1,name:'banana'}];

// a.pop()
// a.shift()
// a.unshift({key:3,name:'apple1'})
// var indexItem=a.find((item)=>{return item.name=="apple"})
// cc.log(indexItem.key)


/*a.map((item,index)=>{
	cc.log(item)
	cc.log(index)
})*/

/*slice  begin,rang_length*/
var fruits = ['Banana', 'Orange', 'Lemon', 'Apple', 'Mango'];
var citrus = fruits.slice(1, 3);
cc.log(citrus)//[ 'Orange', 'Lemon' ]