{"code":400,"msg":"缺少参数 url","usage":"https://api.qmkjcm.cn/api/screenshot?url=https://www.baidu.com","params":{"url":"必填，要截图的网页地址","width":"可选，截图宽度","height":"可选，截图高度","full":"可选，是否长截图 true/false","output":"可选，输出格式","cache":"可选，是否缓存 true/false"}}