js自动查找select下拉的菜单并选择(示例代码)

function find_select(name){ var select = document.getElementsByName(name); var find_str = document.getElementById('to_find_str').value; if(select) {  select = select[0];  var child = select.childNodes;  var can=false,text='',len=child.length,is_end=true;  for(var i=0;i<len;i++)  {   if(can)   {    text = child[i].text;    if( text &&     text.indexOf(find_str)!=-1)    {     //console.log(text);     child[i].selected = true;     var v = child[i].value;     select.value = v;     select.onchange(v);     is_end = false;     break;    }   }   if(child[i].selected)    can = true;  }  if(is_end)   alert('已没有匹配内容'); }}