https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
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JavaScript学习笔记02–基本运算符（basic operators）
1.+= let x =15; x += 10 ;//x = x + 10 = 25; 2.*= let x =15; x *= 10 ;//x = x * 10 = 15…
1.+= let x =15; x += 10 ;//x = x + 10 = 25; 2.*= let x =15; x *= 10 ;//x = x * 10 = 15…