How to get the value entered by the user in javascript

In JavaScript, you can use the value attribute to get the value entered by the user. This attribute can return the value in the input box or text box. The syntax format is "input box or text box object.value;".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Get the value of the input input

 var val = document.querySelector("input");
 val.value;//获得input输入的值

Get the value of the textarea input

 var val = document.querySelector("textarea");
 val.value;//获得textarea输入的值

Get the value of the selected drop-down list

<select id="city">
        <option value="nj">南京</option>
        <option value="sh">上海</option>
        <option value="bj">北京</option>
</select>

 var mySelect=document.querySelector("select#city");
 mySelect.value;

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