javaScript array (array) method of using strings as array subscripts_Basic knowledge

Array is inherited from Object. It has all the functions and characteristics of Object. The following is the case of Object:
New: var object = new Object();
Add: object[strIndex] = value; (strIndex is string)
Delete: delete object[strIndex];
Traversal: for (var strObjIndex in object) object[strObjIndex];
is as follows:

Copy code The code is as follows:

var obj = new Object();
obj ["first"] = "my";
obj["second"] = "name";
obj["third"] = "is";
obj["fourth"] = "chenssy ";

Because Array inherits Object, Array can also use strings as array subscripts:
As follows

Copy code The code is as follows:

var array = new Array();
array ["first"] = "my";
array["second"] = "name";
array["third"] = "is";
array["fourth"] = "chenssy ";

For traversing array numbers, we use a for loop statement. But this for loop is not in this form:

Copy code The code is as follows:

for(int i = 0;i

We can use for/in loop to traverse the array. The for/in loop temporarily assigns the subscript of an array to a variable:

Copy code The code is as follows:

1for(variable in array)

In the first loop, the variable variable will be assigned the subscript value of the first element of the array; in the second loop, the variable variable will be assigned the subscript value of the second element of the array array. scalar value; and so on....
For the above array, use for/in loop to traverse:

Copy code The code is as follows:

for(key in array)