The principle and example of whether the jquery check box is checked or not _jquery

Source: Internet
Author: User
Today to achieve a function is: check box when checking the input form to assign value, check box canceled when the form value cleared.

Effect as shown:

Implementation Source: Cyfid as the ID of the check box
Copy Code code as follows:

$ ("#cyfID"). Click (function () {
var ischeck=$ (this). attr ("checked");
if (ischeck==undefined) {
Clear the Input box
Alert ("");
}else{
Assign a value to an input box
Alert ("QQ");
}
});

The implementation principle is: check box tick when $ (this). attr ("Checked") is checked, not checked for undefined.

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