<style> .classA { color: blue; } .classB { color: red; } </style> <p class="classB classA">123</p>p的颜色是bule还是red? div.margin-top: 30%padding-top: 30%是基于什么的百分比 let a = 0; console.log(a); console.log(b); let b = 0; console.log(c); function c() {}输出什么? function a(b, ...