iframe的传值问题

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iframe子页面传递数据到父页面,window.parent.postMessage({msg:window.saveSignUrl})

    EZCAAjaxIO(json, function (datas) {
        var json_obj = processingreturns(datas);
        if (json_obj == null) {
            return;
        }
        sys_mask.style.display = "none";
        console.log('临时路径',serviceurl + "DownLoad?time=" + new Date().getTime())
        window.saveSignUrl = serviceurl + "DownLoad?time=" + new Date().getTime()
         // iframe传递
         window.parent.postMessage({msg:window.saveSignUrl})
         // iframe传递
        // document.getElementById("iframe_save_file").src = serviceurl + "DownLoad?time=" + new Date().getTime();
    });

父页面这样去接收window.addEventListener('message',this.handleSign)

image.png