解决Extjs上传图片无法预览的解决方法

代码如下: { width: 450, fileUpload: true, fieldLabel: ‘选择图片’, items: [{ xtype: ‘textfield’, id: ‘up_forth’, name: ‘up_forth’, inputType: ‘file’, width: 300 }] } 预览box 代码如下: { columnWidth: .18, bodyStyle: ‘ margin:4px 10px 10px 5px’, layout: ‘form’, items: [{ xtype: ‘box’, autoEl: { width: 150, height: