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JoyfulBoy
javascript的小括号“()”表达式可以帮助我们把javascript语句组合分块并且每对小括号都会返回一个值且在同一语句中具有优先执行权。例如: var result, result2; result = 5 * (2 + 3); //这是一个表达式,分别进行了加法和乘法的运算,结果是25。 alert(result2); //result2等于undefined,声明变量时并未赋...