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                1、每個<span style="color: #c7254e;">case</span>代碼塊內部的<span style="color: #c7254e;">break</span>語句不能少,否則會接下去執行下一個<span style="color: #c7254e;">case</span>代碼塊,而不是跳出<span style="color: #c7254e;">case</span>結構。 2、<span style="color: #c7254e;">switch</span>語句后面的表達式與<span style="color: #c7254e;">case</span>語句后面的表示式,在比較運行結果時,采用的是嚴格相等運算符(<span style="color: #c7254e;">===</span>),而不是相等運算符(<span style="color: #c7254e;">==</span>),這意味著比較時不會發生類型轉換。 ~~~ var i = 1; switch (i) { case true: console.log('i發生類型轉換'); break; default: console.log('i沒有發生類型轉換'); } // i沒有發生類型轉換 ~~~
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