JS Enter建设置

 txtUserName.Attributes.Add("onkeydown", "if(event.which || event.keyCode){if ((event.which == 13) || (event.keyCode == 13)) {document.getElementById('" + this.btn1.UniqueID + "').click();return false;}} else {return true}; ");
            txt2.Attributes.Add("onkeydown", "if(event.which || event.keyCode){if ((event.which == 13) || (event.keyCode == 13)) {document.getElementById('" + this.bt2.UniqueID + "').click();return false;}} else {return true}; ");

 

DIV 居中

 margin:0px auto ;