<input type="text" id="tel">
<script>
  document.addEventListener("blur", function(){
    console.log("my document blur");
  });

  var ipt = document.getElementById("tel");
  ipt.addEventListener("blur", function(){
    console.log("my input blur");
  });
</script>
// 输出结果：document为非表单元素
my input blur

<input type="text" id="tel">
<script>
  document.addEventListener("click", function(){
    console.log("my document click");
  });

  var ipt = document.getElementById("tel");
  ipt.addEventListener("click", function(){
    console.log("my input click");
  });
</script>
// 输出结果：
my input click
my document click

<input type="text" id="ipt">
<input type="button" id="btn" value="点我">
<script>
  var ipt = document.getElementById("ipt");
  ipt.addEventListener("blur", function(){
    console.log("my input blur");
  });

  var btn = document.getElementById("btn");
  btn.addEventListener("click", function(){
    console.log("my button click");
  });
</script>
// 输出结果：
my input blur
my button click

<!-- DOM结构示意 -->
<input type="text" placeholder="请选择姓氏" readonly>
<div class="search-list" data-status="hide">
  <ul>
    <li><a href="javascript:">赵</a></li>
    <li><a href="javascript:">钱</a></li>
    <li><a href="javascript:">孙</a></li>
    <li><a href="javascript:">李</a></li>
  </ul>
</div>

/** 说明：
 * 目前通过ul外层div自定义属性“data-status”控制其是否显示  
 */
(function($){
  $("input").focus(function(){
    // input框获取焦点，展示下拉框
    $(".search-list").attr("data-status", "show");
  }).blur(function(){
    // input框失去焦点，隐藏下拉框
    $(".search-list").attr("data-status", "hide");
  });
  // 选择对应选项，并赋值给input框
  $(".search-list li a").click(function(){
    console.log("执行");
    $("input").val($(this).text());
  });
})(jQuery);

(function($){
  $("input").focus(function(){
    // input框获取焦点，展示下拉框
    $(".search-list").attr("data-status", "show");
  }).blur(function(){
    setTimeout(function(){
      // input框失去焦点，隐藏下拉框
      $(".search-list").attr("data-status", "hide");
    }, 300);
  });
  // 选择对应选项，并赋值给input框
  $(".search-list li a").click(function(){
    console.log("执行");
    $("input").val($(this).text());
  });
})(jQuery);

<input type="text" id="ipt">
<input type="button" id="btn" value="点我">
<script>
  var ipt = document.getElementById("ipt");
  ipt.addEventListener("blur", function(){
    console.log("my input blur");
  });

  var btn = document.getElementById("btn");
  btn.addEventListener("mousedown", function(){
    console.log("my button mousedown");
  });
</script>
// 输出结果：
my button mousedown
my input blur

<input type="button" id="btn" value="点我">
var btn = document.getElementById("btn");
btn.addEventListener("mousedown", function(){
  console.log("my button mousedown");
});
btn.addEventListener("click", function(){
  console.log("my button click");
});
btn.addEventListener("mouseup", function(){
  console.log("my button mouseup");
});

(function($){
  $("input").focus(function(){
    // input框获取焦点，展示下拉框
    $(".search-list").attr("data-status", "show");
  }).blur(function(){
    // input框失去焦点，隐藏下拉框
    $(".search-list").attr("data-status", "hide");
  });
  // 选择对应选项，并赋值给input框
  $(".search-list li a").mousedown(function(){
    $("input").val($(this).text());
  });
})(jQuery);