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修正IE9,因为安全问题无法选择文本域的文本的bug #68

@minghe

Description

@minghe

加行input.blur();

           var input = uploader.get('target').all('input').getDOMNode();
            input.select();
            //确保IE9下,不会出现因为安全问题导致无法访问
            input.blur();
            var src = document.selection.createRange().text;
            var img = $('<img style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);width:300px;visibility:hidden;"  />').appendTo('body').getDOMNode();
            img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
            var width = img.offsetWidth;
            var height = img.offsetHeight;

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