前言

　　最近，需要更新列表字段，字段的类型是用户和组，so写了这么一段代码

function updateUserField(){    var ctx = new SP.ClientContext.get_current();    var list = ctx.get_web().get_lists().getByTitle('My List');    var item = list.getItemById(1);//Item Id    var assignedToVal = new SP.FieldUserValue();    assignedToVal.set_lookupId(12);//User Id in the site collection    item.set_item("AssignedTo",assignedToVal);//AssignedTo is a column name    item.update();        ctx.executeQueryAsync(        function() {            console.log('Updated');        },        function(sender,args) {            console.log('An error occurred:' + args.get_message());        }    );}ExecuteOrDelayUntilScriptLoaded(updateUserField, "sp.js");