微信js的配置对象

ValueStack vs=(ValueStack)request.getAttribute("struts.valueStack");
String openId=(String)vs.findValue("openId");
String url = basePath + "daka"+"?openId="+openId;

String photoUrl=(String)vs.findValue("photoUrl");

// 5.2 图片预览
document.querySelector(‘#previewImage‘).onclick = function () {
wx.previewImage({
current: ‘<%=photoUrl%>‘,
urls: [
‘<%=photoUrl%>‘
]
});
};

原文：http://www.cnblogs.com/jupal/p/5178474.html