jsonp实现ajax跨域

前端

dataType为jsonp，若不指定回调函数名则默认为callback

$.ajax({
        url:headUrl+'/img/getImgList',
        type:'GET',
        dataType:'jsonp',
        data:{
            pageSize:5,
        },
        success:function (data) {

        },
        error:function () {

        }
    });

后端

参数中加入callback，这里tranresult为查询返回的对象，转换为json格式，返回 拼接成js能识别的callback方法的字符串

@RequestMapping(value = "/img/getImgList",method = RequestMethod.GET)
    public String getNewsList(@RequestParam(value = "currentPage", defaultValue = "1", required = false) Integer currentPage,
                                   @RequestParam(value = "pageSize", defaultValue = "5", required = false) Integer pageSize,
                              @RequestParam(value = "callback") String callback){
        TransResult transResult = new TransResult();
        PageResponseDTO pageResponseDTO = new PageResponseDTO(imgService.getImgList(currentPage,pageSize));
        transResult.success();
        transResult.setContent(pageResponseDTO);
        String data= JSON.toJSONString(transResult);
        return callback+"("+ data +")";
    }