好的,我明白了。
这是我的代码,希望对某人有所帮助。我没有包括检索列表项的方法,只是从该函数中获取该人的价值的行。
var _lineManager;
var lineManager = oListItem.get_item("RecruitingManager").get_lookupId();
_lineManager = oWebsite.getUserById(lineManager);
getLineManager();
function getLineManager() {
    context.load(_lineManager);
    context.executeQueryAsync(onGetUserNameSuccessLM, onGetUserNameFailLM);
}
function onGetUserNameSuccessLM() {
    alert(lineManager.get_title());
    var schema = {};
    schema['PrincipalAccountType'] = 'User,DL,SecGroup,SPGroup';
    schema['SearchPrincipalSource'] = 15;
    schema['ResolvePrincipalSource'] = 15;
    schema['AllowMultipleValues'] = false;
    schema['MaximumEntitySuggestions'] = 50;
    schema['Width'] = '280px';
    var users = new Array(1);
    var defaultUser = new Object();
    defaultUser.AutoFillDisplayText = lineManager.get_title();
    defaultUser.AutoFillKey = lineManager.get_loginName();
    defaultUser.Description = lineManager.get_email();
    defaultUser.DisplayText = lineManager.get_title();
    defaultUser.EntityType = "User";
    defaultUser.IsResolved = true;
    defaultUser.Key = lineManager.get_loginName();
    defaultUser.Resolved = true;
    users[0] = defaultUser;
    SPClientPeoplePicker_InitStandaloneControlWrapper('peoplePickerDivLinMan', users, schema);
}
function onGetUserNameFailLM(sender, args) {
    alert('Failed to get user name. Error:' + args.get_message());
}