javascriptのMath JSON

    <script type="text/javascript">
    
        var max = Math.max(3, 54, 32, 16);
        alert(max);    //54
        
        var min = Math.min(3, 54, 32, 16);
        alert(min);    //3

        
    </script>

    <script type="text/javascript">
    
        function selectFrom(lowerValue, upperValue) {
            var choices = upperValue - lowerValue + 1;
            return Math.floor(Math.random() * choices + lowerValue);
        }
        
        var num = selectFrom(2, 10);
        alert(num);   //number between 2 and 10 (inclusive)
        
        var colors = ["red", "green", "blue", "yellow", "black", "purple", "brown"];
        var color = colors[selectFrom(0, colors.length-1)];
        alert(color);  //any of the strings in the array
        
    </script>

    <script type="text/javascript">
        var book = {
                        title: "Professional JavaScript",
                        authors: [
                            "Nicholas C. Zakas"
                        ],
                        edition: 3,
                        year: 2011
                   };

        var jsonText = JSON.stringify(book, ["title", "edition"]);
        alert(jsonText);

    </script>

//      
 <script type="text/javascript">
        var book = {
                        title: "Professional JavaScript",
                        authors: [
                            "Nicholas C. Zakas"
                        ],
                        edition: 3,
                        year: 2011
                   };

        var jsonText = JSON.stringify(book, function(key, value){
            switch(key){
                case "authors":
                    return value.join(",")
                 
                case "year":
                    return 5000;
                    
                case "edition":
                    return undefined;
                    
                default:
                    return value;
            }
        });
        alert(jsonText);

 </script>

    <script type="text/javascript">
        var book = {
                       "title": "Professional JavaScript",
                        "authors": [
                            "Nicholas C. Zakas"
                        ],
                        edition: 3,
                        year: 2011,
                        toJSON: function(){
                            return this.title;
                        }
                   };

        var jsonText = JSON.stringify(book);
        alert(jsonText);

    </script>

    <script type="text/javascript">
        var book = {
                       "title": "Professional JavaScript",
                        "authors": [
                            "Nicholas C. Zakas"
                        ],
                        edition: 3,
                        year: 2011,
                        releaseDate: new Date(2011, 11, 1)
                   };

        var jsonText = JSON.stringify(book);
        alert(jsonText);
        
        var bookCopy = JSON.parse(jsonText, function(key, value){
            if (key == "releaseDate"){
                return undefined;
            } else {
                return value;
            }
        });
        
        alert("releaseDate" in bookCopy);

    </script>