JS Implementation click the checkbox to change the button or text box to a gray unavailable method _javascript tips

The example of this article describes the JS implementation click CheckBox to change the button or text box gray is not available method. Share to everyone for your reference. Specifically as follows:

In the registration often will not see, if you do not click to read the registration license, the Submit button is gray, failure can not be submitted, you must point it, this JS code is to achieve such a function, only you click on the confirmation submission, the button below to enter into force.

The effect is as shown in the following illustration:

The specific code is as follows:

The

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