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  4. \u5bf9\u4e8e\u6bcf\u4e2a<li>\u5143\u7d20\uff0c\u6211\u901a\u8fc7querySelector\u83b7\u53d6\u5176\u4e2d\u7684<a>\u5143\u7d20\u548c<li>\u5143\u7d20\uff0c\u5e76\u5206\u522b\u83b7\u53d6\u8bfe\u7a0b\u540d\u79f0\u548c\u72b6\u6001\u4fe1\u606f\u3002\u7136\u540e\uff0c\u6211\u5c06\u8bfe\u7a0b\u540d\u79f0\u548c\u72b6\u6001\u4fe1\u606f\u8f93\u51fa\u5230\u65e5\u5fd7\u9762\u677f\u4e2d\u3002<\/li>\n\n\n\n
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  6. \u63a5\u7740\uff0c\u6211\u4f7f\u7528querySelectorAll\u83b7\u53d6\u9875\u9762\u4e0a\u6240\u6709\u4ee5”javascript:ShowCourseware”\u5f00\u5934\u7684<a>\u5143\u7d20\u3002<\/li>\n\n\n\n
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  8. \u7136\u540e\uff0c\u6211\u4f7f\u7528querySelectorAll\u83b7\u53d6\u9875\u9762\u4e0a\u6240\u6709\u5e26\u6709”bg1″\u6216”bg2″\u7c7b\u540d\u7684\u5143\u7d20\uff0c\u5e76\u901a\u8fc7filter\u65b9\u6cd5\u7b5b\u9009\u51fa\u72b6\u6001\u4e3a”\u672a\u5f00\u59cb”\u6216”\u672a\u5b66\u5b8c”\u7684\u9879\u76ee\u3002<\/li>\n\n\n\n
  9. \u5bf9\u4e8e\u7b5b\u9009\u51fa\u7684\u6bcf\u4e2a\u9879\u76ee\uff0c\u6211\u901a\u8fc7querySelector\u83b7\u53d6\u5176\u4e2d\u7684<a>\u5143\u7d20\uff0c\u5e76\u901a\u8fc7click()\u65b9\u6cd5\u70b9\u51fb<a>\u5143\u7d20\uff0c\u5e76\u5c06\u70b9\u51fb\u7684\u94fe\u63a5\u5730\u5740\u8f93\u51fa\u5230\u65e5\u5fd7\u9762\u677f\u4e2d\u3002<\/li>\n\n\n\n
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  11. \u6700\u540e\uff0c\u6211\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3acheckVideoStatus\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u68c0\u67e5\u89c6\u9891\u64ad\u653e\u72b6\u6001\u3002\u5728\u51fd\u6570\u4e2d\uff0c\u6211\u901a\u8fc7querySelector\u83b7\u53d6\u89c6\u9891\u64ad\u653e\u65f6\u95f4\u7684\u663e\u793a\u533a\u57df\uff0c\u5e76\u5224\u65ad\u5f53\u524d\u65f6\u95f4\u662f\u5426\u7b49\u4e8e\u603b\u65f6\u95f4\u3002\u5982\u679c\u76f8\u7b49\uff0c\u8868\u793a\u89c6\u9891\u5df2\u7ecf\u64ad\u653e\u5b8c\u6bd5\uff0c\u5c06\u9875\u9762\u91cd\u5b9a\u5411\u5230\u6307\u5b9a\u94fe\u63a5\uff1b\u5426\u5219\uff0c\u8868\u793a\u89c6\u9891\u8fd8\u672a\u64ad\u653e\u5b8c\u6bd5\uff0c\u8f93\u51fa\u76f8\u5e94\u7684\u65e5\u5fd7\u4fe1\u606f\u3002<\/li>\n\n\n\n
  12. \u6700\u540e\uff0c\u6211\u4f7f\u7528setInterval\u8bbe\u7f6e\u5b9a\u65f6\u5668\uff0c\u6bcf\u969410\u79d2\u949f\u8c03\u7528\u4e00\u6b21checkVideoStatus\u51fd\u6570\uff0c\u7528\u4e8e\u5faa\u73af\u68c0\u67e5\u89c6\u9891\u64ad\u653e\u72b6\u6001\u3002<\/li>\n<\/ol>\n\n\n\n

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