<form> Select a User: <select name="users" onchange="showUser(this.value)"> <option value="1">Peter Griffin</option> <option value="2">Lois Griffin</option> <option value="3">Glenn Quagmire</option> <option value="4">Joseph Swanson</option> </select> </form>
利用form表单制作下拉选择框option
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