Details about jQuery ajax asynchronous transmission instances

Ajax asynchronous transmission is an important function widely used in ajax. with ajax asynchronous transmission, we can implement many very good functions, the following small series will introduce some jQuery ajax asynchronous transmission instances. I hope these instances will help you.

In jquery, we need to use Asynchronous or synchronous transmission. You only need to set true or false settings in the async of ajax parameters.

For example, asynchronous transmission is not used.

The Code is as follows:	Copy code
Function changeCartState (arr ){ Var str = false; $. Ajax ({ Type: 'post ', Async: false, Url: '/scripts/cart. php ', Data: {act: 'buy', itemId: arr }, Success: function (msg ){ If (msg! = 1 ){ Str = false; } Else { Str = true; } } });   Return str;   }

Note that I have set async: false. To use asynchronous transmission, we only need to use async: true or do not write it directly.