On JavaScript array and dictionary _javascript skills

The array of Javascript arrays, both an array and a dictionary (Dictionary).

Let's take a look at the use of arrays.

Copy Code code as follows:

var a = new Array ();
A[0] = "Acer";
A[1] = "Dell";
for (var i in a) {
alert (i);
}

The code above creates an array with each element being a string object.

The array is then traversed. Note that the result of I is 0 and 1,a[i] is a string.

This is much like the properties of the traversal object mentioned in the previous article.

Next look at the use of the dictionary.

Copy Code code as follows:

var computer_price = new Array ();
computer_price["Acer"] = 500;
computer_price["Dell" = 600;
Alert (computer_price["Acer"]);

We can even walk through the array like the above (the dictionary)

Copy Code code as follows:

for (var i in Computer_price) {
Alert (i + ":" + computer_price[i]);
}

Here I is the dictionary of each key value. The output results are:

Copy Code code as follows:

acer:500
dell:600

Next, take a look at the interesting things about JavaScript, or the example above.

We can think of Computer_price as a Dictionary object, and each of its key values is an attribute.

That is to say that Acer is a computer_price attribute. We can use it this way: Computer_price. Acer

Let's look at the simplified declarations of dictionaries and arrays.

Copy Code code as follows:

var array = [1, 2, 3]; Array
var array2 = {"Acer": $, "Dell": 600}; Dictionary
Alert (array2. Acer); 50

The statement to the dictionary is the same as the previous one. In our example, Acer is a key value, but also as a property of the Dictionary object.

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