The Select, option label in the form validation of the front-end development diary

The framework of various forms validation determines whether or not a select is a value, which is essentially the Value property of option. The first option of the select in the HTML code is basically "please select", but "select" when the form is determined is not selected. So <option value= "" > Please select the value in </option> must be equal to null value, otherwise the form verification when the select is selected is worth.

This encountered this situation, our source code is written <option value= "0" > Please select </option>, so the verification has been a problem, said hehe ....