摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script> var x = 10 // var ret = x++ // x +=1 // x = x+1 //先赋值再计算 va 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script> var age = 20 // 成年人观看 if (age > 18){ console.log("成年人观看") } 阅读全文