JavaScript determines whether the textarea value is empty and gives corresponding prompts

In web design, we often use JavaScript to determine whether the user enters legal data. If the user does not enter data, a corresponding prompt will be given. So how to judge? Here we introduce to you the method of using JavaScript to determine whether the textarea value is empty.

The following is a JavaScript function:

 if(document.getElementById("htmer").value==''){alert("Please enter content!");return false;}

Note that the red part in the above code =='' is single quotes instead of double quotes, which can reduce a lot of unnecessary trouble.