chuck
/
custom-tool-function


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="./src/apply.js"></script>
    <script>
        function add (a,b){
            console.log(this)
            return a + b + this.c
        }
        let obj = {
            c: 5
        }
        window.c = 6
        console.log(apply(add,obj,[1,2]))
        console.log(apply(add,null,[1,2]))
    </script>
</body>
</html>