这个“欺骗”的副作用是，glyphicon类会改变输入控件的字体。

小提琴

<input class="form-control glyphicon" type="search" placeholder="&#57347;"/>

如果你想摆脱副作用，你可以删除“glyphicon”类，并添加以下CSS(可能有更好的方法来设置占位符伪元素，我只在Chrome上测试过)。

小提琴

.form-control[type="search"]::-webkit-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]:-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]::-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]:-ms-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}

可能有一个更干净的解决方案:

小提琴

CSS

.form-control.glyphicon {
    font-family:inherit;
}
.form-control.glyphicon::-webkit-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon:-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon::-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon:-ms-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}

HTML

<input class="form-control glyphicon" type="search" placeholder="&#57347; search" />
<input class="form-control glyphicon" type="text"  placeholder="&#57352; username" />
<input class="form-control glyphicon" type="password"  placeholder="&#57395; password" />

对于Bootstrap 3.3.5，我也有一个决定:

<div class="col-sm-5">
    <label for="date">
       <input type="date" placeholder="Date" id="date" class="form-control">         
    </label>
    <i class="glyphicon glyphicon-calendar col-sm-pull-2"></i>
</div>

对于输入，我有这样的东西:

这个“欺骗”的副作用是，glyphicon类会改变输入控件的字体。

小提琴

<input class="form-control glyphicon" type="search" placeholder="&#57347;"/>

如果你想摆脱副作用，你可以删除“glyphicon”类，并添加以下CSS(可能有更好的方法来设置占位符伪元素，我只在Chrome上测试过)。

小提琴

.form-control[type="search"]::-webkit-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]:-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]::-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control[type="search"]:-ms-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}

可能有一个更干净的解决方案:

小提琴

CSS

.form-control.glyphicon {
    font-family:inherit;
}
.form-control.glyphicon::-webkit-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon:-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon::-moz-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}
.form-control.glyphicon:-ms-input-placeholder:first-letter {
    font-family:"Glyphicons Halflings";
}

HTML

<input class="form-control glyphicon" type="search" placeholder="&#57347; search" />
<input class="form-control glyphicon" type="text"  placeholder="&#57352; username" />
<input class="form-control glyphicon" type="password"  placeholder="&#57395; password" />

用Bootstrap测试4。

获取一个表单控件，并将is-valid添加到它的类中。注意到控件如何变成绿色，但更重要的是，注意到控件右侧的复选符号图标吗?这就是我们想要的!

例子:

.my-icon { padding-right: calc(1.5em + .75rem); background-image: url('https://use.fontawesome.com/releases/v5.8.2/svgs/regular/calendar-alt.svg'); background-repeat: no-repeat; background-position: center right calc(.375em + .1875rem); background-size: calc(.75em + .375rem) calc(.75em + .375rem); } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script> <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script> <div class="container"> <div class="col-md-5"> <input type="text" id="date" class="form-control my-icon" placeholder="Select..."> </div> </div>

input { border:solid 1px #ddd; } input.search { padding-left:20px; background-repeat: no-repeat; background-position-y: 1px; background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAASCAYAAABb0P4QAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADbSURBVDhP5ZI9C4MwEIb7//+BEDgICA6C4OQgBJy6dRIEB6EgCNkEJ4e3iT2oHzH9wHbpAwfyJvfkJDnhYH4kHDVKlSAigSAQoCiBKjVGXvaxFXZnxBQYkSlBICII+22K4jM63rbHSthCSdsskVX9Y6KxR5XJSSpVy6GbpbBKp6aw0BzM0ShCe1iKihMXC6EuQtMQwukzPFu3fFd4+C+/cimUNxy6WQkNnmdzL3NYPfDmLVuhZf2wZYz80qDkKX1St3CXAfVMqq4cz3hTaGEpmctxDPmB0M/fCYEbAwZYyVKYcroAAAAASUVORK5CYII=); } <input class="search">

您应该能够使用现有的引导类和一些自定义样式来实现这一点。

<form>
    <div class="input-prepend">
        <span class="add-on">
            <i class="icon-user"></i>
        </span>
        <input class="span2" id="prependedInput" type="text" placeholder="Username" style="background-color: #eeeeee;border-left: #eeeeee;">
    </div>         

编辑图标是通过图标用户类引用的。这个答案是在Bootstrap版本2的时候写的。你可以在下面的页面上看到参考:http://getbootstrap.com/2.3.2/base-css.html#images