HTML：
<div class="form-group">
<label class="control-label" for="srAddress">SR地址</label>
<input type="text" name="srinterfaceip" class="form-control" id="srAddress" placeholder="请输入接口地址"/>
</div>
<div class="form-group">
<label class="control-label" for="interfaceAddress">逻辑地址</label>
<input type="text" name="srloopbackip" class="form-control" id="logicalAddress" placeholder="请输入接口地址" />
</div> js:
//添加BR的时将BR地址同时更新逻辑地址
$("#srAddress").bind("keyup",function(){
$("#logicalAddress").val(this.value);
});