select选择多个值的方式

<select>
<option value>请选择...</option>
</select>
<script>
var $arr = [
    {name:'lee',sex:'male'},
    {name:'zhangsan',sex:'femal'}
]
var select = document.getElementsByTagName('select')[0]
function render(arr){
    var str = ''
    for(var i in arr){
        var name = arr[i]['name']
        var sex = arr[i]['sex']
        str += "<option value='"+name+";"+sex+"'>"+name+"</option>"
    }
    select.innerHTML += str
}
select.onchange = render($arr)
</script>