A detailed explanation of arrays and a small exercise for bubble sort

Array definition:

new Arry(); Its length is dynamically changed, and elements of any type can be placed in it. The first way of definition var arr = new Array();

　　arr[0] = "a";
　　arr[1] = "bb";
　　 arr[4] = 123;
　　arr["name"] = "Hawk";
　　alert (arr["name"]);
Second definition
　　var arr2 = new Array("aaa","bbb","ccc");
　　alert(arr2[0]);

　　var arr3 = new Array(5);
　　 alert(arr3.length);The
third way
　　 var arr4 = ["value1","value2"];
　　alert(arr4[0])
value
var arr5 = new Array();
arr5.push("a");
arr5.push("b");
arr5.push("c");
arr5.push("d");
arr5.











var arr = new Array();
arr[0] = "a";
arr[5] = "bb";
arr[4] = 123;
arr["name"] = "猛男";
for(var x in arr)
{
alert(arr[x]);
}


var arr = new Array();
arr.push(5);
arr.push(3);
arr.push(2);
arr.push(0);
arr.push(8);

for(i=0;i<arr.length;i++){
for(j=i;j<arr.length;j++){
  if(arr[i]>arr[j]){
   temp = arr[i];
arr[i] = arr[j];
   arr[j] = temp;
}
}
}
for(var x in arr){
alert(arr[x])
}



var arr = new Array();
arr.push(5);
arr.push(3);
arr.push(2);
arr.push(0);
arr.push(8);
var temp;
for(var i=0;i<arr.length;i++){
for(var j=i+1;j<arr.length;j++)
{
if(arr[i]>arr[j]){
temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
}
for(var x in arr)
{
alert(arr[x]);
}