技術標籤：陣列javascript

	every 		遍歷陣列每一項，每一項返回true,最終結果為true.有一項返回false,停止遍歷,結果返回為false。不改變原陣列。
	some 		判斷陣列中是否存在滿足的條件，若存在返回true，不存在返回false
	filter		過濾掉陣列中不滿足條件的值,返回一個新陣列,不改變原陣列
	includes	判斷陣列中是否包含某一個元素，若包含返回true，否則返回true
	find		查詢陣列中符合條件的第一個元素並返回該元素
	findIndex	查詢陣列中符合條件的第一個元素的索引

	{
		let arr = [1,2,
 
3,4];
		let arr1 = arr.every((item,index,arr)=>{	
		   return item > 0; 
		});		
		console.log(arr1);		//true
	}
	
	{
		let arr = ["z","g","j"];
		let arr1 = arr.some(function(m,index,arr){
			return m == "z"
		})
		console.log(arr1)		//true
	}
	
	{
		let arr =
 
 ["z","g","j"]
		let arr1 = arr.filter(function(m,index,arr){
			return m != "z"
		})
		console.log(arr1)		//["g", "j"]
	}
	
	
	{
		let arr = ["z","g","j"]
		let arr1 = arr.includes("z")
		console.log(arr1)
 
;		//true  
	}
	
	
	{
		let arr = [1,33,44,22,6,9]
		let arr1 = arr.find(v => v > 10)					
		console.log(arr1)      //33									
	}



	{													
		let arr = [1,33,44,22,6,9]
		let arr1 = arr.findIndex(v => v > 10)
		console.log(arr1)		//1
	}