SharePoint: 设置People or Group字段默认值为当前用户

check the code below:

<script type="text/javascript">
_spBodyOnLoadFunctionNames.push("fillDefaultValues");

function fillDefaultValues() {
  fillPeoplePickerWithCurrentUser('TestUser'); //这里是字段的名字
}

function fillPeoplePickerWithCurrentUser(pickerName) {
  //get the current user from the welcome menu
  var currentUser = getCurrentUser();

  //check to see that we've got it
  if(currentUser != null){
    //get the people pickers input div
    var pp = getPickerInputElement(pickerName);
    //set it to the current user if we've found it
    if(pp != null)
      pp.innerHTML = currentUser;
  }
}

function getCurrentUser(){
  var tags = document.getElementsByTagName('a');
  for (var i=0; i < tags.length; i++){
    if(tags[i].innerText.substr(0,7) == 'Welcome'){
      return tags[i].innerText.substr(8,tags[i].innerText.length);
    }
  }
}

function getPickerInputElement(fieldsInternalName){
  var result  = "";
  var divs = document.getElementsByTagName("DIV");
  for(var i=0; i < divs.length ; i++){
  if(divs[i].id=="WebPartWPQ2"){
    var tds = divs[i].getElementsByTagName("TD");
    for(var j=0; j < tds.length; j++){
      var cellHTML = tds[j].innerHTML;
      if(cellHTML.indexOf('FieldInternalName="' + fieldsInternalName + '"') >= 0){
        var innerDivs = tds[j].getElementsByTagName("DIV");
        for(var k=0; k < innerDivs .length; k++){
          if(innerDivs[k].id.indexOf("UserField_upLevelDiv") > 0){
            result = innerDivs[k];
            break;
          }
        }
      }
     }
  }
}
return result;
}
</script> 

设置其他字段的默认值： Using Javascript to Manipulate a List Form Field