JavaScript中的循环

                                                           JavaScript中的三种循环

   <script>var arr=[1,2,3,4,5];for(var i =0;i<arr.length;i++){console.log("for...>"+arr[i]);}for(var i in arr){console.log("for in....>"+arr[i]);}arr.forEach(value => {console.log("forEach....>"+value);})</script>