Action:
- Java code
package com.trafic.action;import java.util.List;import com.opensymphony.xwork2.ActionSupport;import com.trafic.bean.Accident;import com.trafic.service.AccidentService;public class GetAccidentPointsAction extends ActionSupport { private static final long serialVersionUID = 3511462933996799995L; private AccidentService as; private String validate; public void setAs(AccidentService as) { System.out.println("setAs..."); this.as = as; } public String getValidate() { return validate; } public void setValidate(String validate) { this.validate = validate; } @Override public String execute() throws Exception { List<Accident> all = as.getAllAccident(); StringBuilder jsonBuilder = new StringBuilder(); jsonBuilder.append("{\"points\":[{"); for (int i = 0; i < all.size(); i++) { if (i != all.size() - 1) { jsonBuilder.append("\"x\":" + all.get(i).getAcc_x() + ",\"y\":" + all.get(i).getAcc_y() + "},{"); } else { jsonBuilder.append("\"x\":" + all.get(i).getAcc_x() + ",\"y\":" + all.get(i).getAcc_y() + "}]}"); } } this.validate = jsonBuilder.toString(); System.out.println(validate); return SUCCESS; }}我需要取得的是validate这个字符串组成的JSON：
期中validate字符串为：{"points":[{"x":123.0,"y":321.0}]}
在JSP中通过AJAX取得了该JSON；
问题就出现了：
- JScript code
$.post("getAllAccident",function(validate){ alert(validate);//显示[Objext Object] [color=#FF0000]alert(validate.points[0].x); [/color] 这句话就不会弹出内容！为什么呢？ })我做了这个测试：
- JScript code
var w = {"points":[{"x":123.0,"y":321.0}]};alert(w); //弹出[Object Object]alert(w.points[0].x); //弹出123但是上面的访问也是按这个来的。怎么就会出错？
还是我JSON返回的就有问题？困惑了半天了，求大侠解答！谢谢
------解决方案--------------------------------------------------------
是个字符串，没有变成JSON对象；自己转换一次吧。
$.post("getAllAccident",function(validate){
validate = eval(validate.validate);
alert(validate.points[0].x);
})