KnockOut下的离开检测

<input type="text" class="form-control" data-bind="event:{ blur:$root.checkDuplicate }" value="@Model.DeptName" name="DeptName" id="DeptName" placeholder="客户简称" />*

   var contactVM = function(){
        var self = this;

self.checkDuplicate = function(){
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既可