Question

下拉菜单怎么默认选择某项

Answer 1

window.onload=function(){ var opts = document.getElementById('sel').getElementsByTagName('option'),opt_value = '4'; for(var i in opts){ if(opts[i].value==opt_value){ opts[i].selected = 'selected'; return; } } } <select id="sel"> <option value="">-----</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option></select>