单击时选择(突出显示)文本框的内容

.blurred{
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}
div{
  width: 100px;
    height: 100px;
    background-color: #ccc;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<!-- If what you want is to blur the element -->
<input type="text" value="click me to blur me" onclick="$(this).addClass('blurred')"/>

<hr/>

<!-- If what you want is to select all the content -->
<input type="text" value="click me to select all the data" onclick="$(this).select()"/>