// Warn when two users are editing the same record
function onSubmit() {
var updatedOn = gel(‘onLoad_sys_updated_on‘).value;
if (!updatedOn)
return;
var gr = new GlideRecord(g_form.getTableName());
if (!gr.get(g_form.getUniqueValue()))
return;
var dbUpdatedOn = gr.sys_updated_on + ‘‘;
var dbUpdatedBy = gr.sys_updated_by + ‘‘;
if (updatedOn != dbUpdatedOn)
return confirm(dbUpdatedBy + " " + getMessage("updated this record since you opened it - overwrite with your changes? Additional comments and Work notes will not be overwritten."));
}onSubmit 检查是否有冲突修改，弹出对话框让user确定或者取消
原文：http://blog.51cto.com/13716461/2341479