JS 设置下拉选择框默认值

//根据下拉对象默认选中后台对应的记录function setSelectOption(objSelect, targetValue){  if(objSelect){    var options = objSelect.options;    if(options){      var len = options.length;      for(var i=0;i<len;i++){        if(options[i].value == targetValue){          options[i].defaultSelected = true;          options[i].selected = true;          return true;        }      }    } else {      alert('missing element(s)!');    }} else {    alert('missing element(s)!');}}

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