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<html>
<body>
<select id="selectedId">
<option value="1" >天津</option>
<option value="2"> 北京</option>
<option value="3">上海</option>
</select>
</body>
<script src="jquery.js" type="text/javascript"></script>
<script>
// $("#selectedId").val("3");
$("#selectedId").find("option").eq(2).attr("selected","selected")
</script>
</html>
改为$("#select_id option[text='广州市']").attr("selected", "selected");
<span id="xx">广州市</span>
<select id="select_id">
<option value="北京市">北京市</option>
<option value="广州市">广州市</option>
<option value="上海市">上海市</option>
</select>
<script>
$("#select_id option[value='广州市']").attr("selected", true);
</script>
或者<script>
<script>
//普通js写法
document.getElementById("select_id").options[1].setAttribute("selected", true);
//jquery应该这样写
$("#select_id option").eq(1).attr("selected",true);
</script>