input 框后面带单位、提示

css

---

   .input-group {
            position: relative;
            display: table;
            border-collapse: separate;
            width: 100%;
        }
        .input-group .form-control, .input-group-addon {
            display: table-cell;
        }
        .input-group-addon {
            padding: 5px;
            text-align: center;
            background-color: #eee;
            border-radius: 2px;
            border-top-left-radius: 0;
            border-bottom-left-radius: 0;
        }
        .input-group .form-control:first-child{
            border-top-right-radius: 0;
            border-bottom-right-radius: 0;
        }

html

---

                            
                            dBi
                            

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				dBi
			

		
		

			

				
				km/h
			

		
		

			

				
				m/s
			

		
	

result         

上班四个多月，学到了，加油！