1.容器内的组件要么指定宽度，要么在anchor中同时指定高/宽，
2.anchor值通常只能为负值(指非百分比值)，正值没有意义，
3.anchor必须为字符串值
图形结果演示：
。net代码
- Ext.onReady(function() {
- var panel1 = new Ext.Panel({
- title: "panel1",
- height: 100,
- anchor: '-50',
- html: "高度等于100，宽度=容器宽度-50"
- });
- var panel2 = new Ext.Panel({
- title: "panel2",
- height: 100,
- anchor: '50%',
- html: "高度等于100,宽度=容器宽度的50%"
- });
- var panel3 = new Ext.Panel({
- title: "panel3",
- anchor: '-10, -250',
- html: "宽度=容器宽度-10,高度=容器宽度-250"
- });
- var win = new Ext.Window({
- title: "Anchor Layout",
- height: 400,
- 400,
- plain: true,
- layout: 'anchor',
- items: [panel1, panel2,panel3]
- });
- win.show();
- });