Weui显示预览图片接口wx.previewImag接口只支持全路径图片，相对路径图片，需要转为全路径,示例如下:

wx.ready(function() {
	//var urls = [ '../images/xxx.jpg'];
	var urls = [ getRootPath()+'/images/xxx.jpg'];
	wx.previewImage({
		current : urls[0],
		urls : urls
	});
});

function getRootPath() {
	var pathName = window.location.pathname.substring(1);
	var webName = pathName == '' ? '' : pathName.substring(0, pathName.indexOf('/'));
	return window.location.protocol + '//' + window.location.host + '/' + webName + '/';
}

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