[LayaAir 2.0]聊天室使用HTMLDivElement，宽度被固定为180了，这个怎末改，求救

var HTMLDivElement = Laya.HTMLDivElement;
var textfiled = new HTMLDivElement();
this.addChild(textfiled);
textfiled.pos(10, 10);
textfiled.width = 890;
textfiled.style.color = "#10922a";
textfiled.style.font = "黑体";
textfiled.style.fontSize = 30;
textfiled.style.valign = "middle";
var clientName = "<span style='color:#ffcc00;'>" + "聊天室" + "：</span>";
var clientInfo = "<span style='color:#ff9900;'>【LayaBox群】</span>" + clientName;
var msgHtml = "您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好您好";
textfiled.innerHTML = clientInfo + msgHtml;
textfiled.height = textfiled.contextHeight + 10;