Gets the value of the Drop-down list box is an array, split,$.inarray example _javascript tips

Today I met a thief with a broken egg:

1. I click events from a drop-down list select to get the value of the options

Copy Code code as follows:

var product_id = $ (this). Val ()

Console.log out is found to be a number of groups, such as: ["51"]

And then make the following judgments

Copy Code code as follows:

Console.log (product_id);
if (product_id = = ' Wuyi ') {alert (111);}
if (product_id[0] = = ' Wuyi ') {alert (222);}

Found can be pop-up balloon, ni Ma This is not a hole in me?

2, I use this product_id to match whether or not to be included in an array

Error code:

Copy Code code as follows:

var result = $.inarray (product_id,arr_product_ids);

Correct code:

Copy Code code as follows:

var result = $.inarray (product_id[0],arr_product_ids);

$.inarray () must use product_id[0], that is, cannot use an array

It is not until today that the Drop-down list gets the value of the number group, with a deeper understanding of the great God, to explain.