控件自适应文本宽度

function AdjustADWidth(e, changeWidth) {
var event = $.event.fix(e);
var elem = event.target;
while ($(elem)[0].tagName.toLowerCase() != "td") {
elem = $(elem).parent();
}
if ((changeWidth < 0 && elem.width() > 40) || (changeWidth > 0 && elem.width() < 500)) {
elem.width(elem.width() + changeWidth);
}
}