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这段 javascript 是按什么顺序执行的呢?

我在chrome控制台调试javascript javascript代码------- var test=["dd","ddd","sda"]; console.log(test.toString()); console.log(test.valueOf()); console.log(test) console.log(test.splice(2,1,"你好","Hello")); 结果--------------- dd,ddd,sda ["dd", "ddd", "你好", "Hello"] ["dd", "ddd", "你好", "Hello"] ["sda"] 请问这是为什么呢?第二句和第三句结果怎么会有“你好” “Hello”呢?
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