javascript - 强制表单文本为小写(Forcing form text to be lower-case)

Question

How could I force the text in the "username" text input to be lower-case regardless of what user types?(不管什么用户类型，如何强制“用户名”文本input中的文本小写？)

<div class="register">
   <label for="username">Select username:</label>
</div> 
<div class="registerform">
    <input name="username" class="registerfont" type="text"
           id="username" maxlength="15" style="height:35px; width:300px">
</div>

  ask by John translate from so

Answer 1

in CSS:(在CSS中：)

form input[type="text"] {
    text-transform: lowercase;
}

otherwise in JS:(否则在JS中：)

var text="this is my text.";
var lowercase=text.toLowerCase();