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函数参数与返回值 、模板字面量及模板函数（标签函数）
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函数与参数

默认参数

实参数量小于形参数量的情况下给形参一个默认参数；

归并函数参数

在实参数量大于形参数量时 用归并的方法将多余的参数接收到数组里面；

模板字面量

模板字面量用反引号表示 可以在反引号里面加入变量或表达式用${}来表示；

模板函数

模板函数就是用模板字面量为参数的函数块，

Correcting teacher：PHPzPHPz

Correction status：qualified

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