SELECT * FROM `sucai_js` ORDER BY RAND() LIMIT 1
优化后：
SELECT *
FROM `sucai_js`
WHERE id >= (SELECT FLOOR( MAX(id) * RAND()) FROM `sucai_js` )
ORDER BY id LIMIT 1;
SELECT * FROM `sucai_js` ORDER BY RAND() LIMIT 1
优化后：
SELECT *
FROM `sucai_js`
WHERE id >= (SELECT FLOOR( MAX(id) * RAND()) FROM `sucai_js` )
ORDER BY id LIMIT 1;
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