现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript Assignment Operators</title>
</head>
<body>
    <script>
    var x;    // Declaring Variable
 
    x = 10;
    document.write(x + "<br>"); // Prints: 10
    
    x = 20;
    x += 30;
    document.write(x + "<br>"); // Prints: 50
     
    x = 50;
    x -= 20;
    document.write(x + "<br>"); // Prints: 30
     
    x = 5;
    x *= 25;
    document.write(x + "<br>"); // Prints: 125
     
    x = 50;
    x /= 10;
    document.write(x + "<br>"); // Prints: 5
     
    x = 100;
    x %= 15;
    document.write(x); // Prints: 10
    </script>
</body>
</html>