获取selected的值

html

  <select class="contents_input_option" onchange="gradeChange()" id="pid" name="verify_id" placeholder="请选择一项">
                    <option value="-1">请选择签署人</option>
                    {foreach $userInfo as $key=>$v}
                    <option value="{$key}" data-name="{$v.name}" data-phone="{$v.phone}" data-account_type="{$v.account_type}">{$v.name}
                    </option>
                    {/foreach}
                </select>

js

 function gradeChange(){
        var op = document.getElementById("pid");
        
        console.log(op.options[op.selectedIndex].value);
    }
　　

获取data-name的值

function gradeChange(){
        var op = document.getElementById("pid");
        
        console.log(op.options[op.selectedIndex].getAttribute("data-name"));

　      console.log(op.options[op.selectedIndex].dataset.name);
}

　　

jq的方法

var id = $("#pid").data("name"); 

var id = $("#pid").attr("data-name");