在Extjs中，用layout:column的布局，window或panel大小设为百分比，里面的控件不随容器大小而改变（自动缩放）。

如下：

            <link rel="stylesheet" type="text/css" href="./extjs/resources/css/ext-all.css" />
            <script type="text/javascript" src="./extjs/adapter/ext/ext-base.js"></script>
            <script type="text/javascript" src="./extjs/ext-all-debug.js"></script>
            <script type="text/javascript" src="./extjs/examples.js"></script>

            <script type="text/javascript">
                Ext.onReady(function(){
                    Ext.QuickTips.init();

                    new Ext.FormPanel({
                        renderTo:document.body,frame:true,id:'twindow',
                        title: '布局测试',labelAlign: 'right',
                        plain:true,layout:"form",
                        items: [{layout:"column",baseCls:"x-plain",style:"padding:5px",
                                items:[{columnWidth:.5,layout: 'form',
                                        items: [{
                                                xtype:'textfield',
                                                fieldLabel: 'First Name',
                                                name: 'first',
                                                anchor:'95%'
                                            }, {
                                                xtype:'textfield',
                                                fieldLabel: 'Company',
                                                name: 'company',
                                                anchor:'95%'
                                            }]
                                    },{columnWidth:.5,layout: 'form',
                                        items: [{
                                                xtype:'textfield',
                                                fieldLabel: 'Last Name',
                                                name: 'last',
                                                anchor:'95%'
                                            },{
                                                xtype:'textfield',
                                                fieldLabel: 'Email',
                                                name: 'email',
                                                vtype:'email',
                                                anchor:'95%'
                                            }]
                                    }]
                            }],

                        buttons: [{text: 'Save'},{text: 'Cancel'}]
                    });
                });
            </script>

在

                });
            </script>

前加入下面代码

                    window.onresize = function() {
                        var myWidth = 0, myHeight = 0;
                        if (typeof (window.innerWidth) == 'number') {
                            //Non-IE
                            myWidth = window.innerWidth;
                            myHeight = window.innerHeight;
                        } else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
                            //IE 6+ in 'standards compliant mode'
                            myWidth = document.documentElement.clientWidth;
                            myHeight = document.documentElement.clientHeight;
                        } else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
                            //IE 4 compatible
                            myWidth = document.body.clientWidth;
                            myHeight = document.body.clientHeight;
                        }
                        var w = Ext.getCmp('twindow');
                        w.setPosition(0, 0);
                        w.setWidth(myWidth);
                        //w.setSize(myWidth, myHeight);
                    }