4 methods of array traversal

Four methods of traversing an array

var arr = ["angular","Vue","nodejs","recat"];

1.  for  loop

for(var i= 0;i<arr.length;i++){  
    console.log("第一种遍历方式\t"+arr[i]);  
} 

2.  for...in  loop

for(var index in arr){  
    console.log("第二种遍历方式\t"+arr[index]);   
}  

3.  for...of  loop

for(var ele of arr){  
   console.log("第四种遍历方式\t"+ele);  
}  

4、  forEach

arr.forEach(function(ele,index){  
    console.log("第三种遍历方式\t"+arr[index]+"-----"+ele);  
}); 

Finally try it yourself...