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 Call Methods</title>
</head>
<body>
    <script> 
    var objA = {
        name: "object A",
        say: function(greet) {
            document.write(greet + ", " + this.name);
        }
    }
    
    objA.say("Hi"); // Prints: Hi, object A
    document.write("<br>");
    
    var objB = {
        name: "object B"
    }
    
    /* The objB doesn't have say() method, but it can borrow it from objA */
    objA.say.call(objB, "Hello"); // Prints: Hello, object B
    </script>
</body>
</html>