学习JavaScript王者归来_02 

<html>
    <head>
        <title></title>
        <script>
            function ArrayList(array) {
                this._arr = typeof(array) = "string" ? array.split(",") : array;
            }

            //定义一个$each函数，这个函数接受一个闭包作为参数
            ArrayList.prototype.$each = function(closure) {
                var ret = [];
                for(var i = 0; i < this._arr.length; i++) {
                    ret.push(closure.call(this, this._arr[i]));
                }

                return ret;
            }

            ArrayList.prototype.add = function(num) {
                return this.$each(function(a) {return parseFloat(a) + parseFloat(num)});
            }

            ArrayList.prototype.multiply = function(factor) {
                return this.$each(function(a) {return parseFloat(a) * parseFloat(factor)});
            }
        </script>
    </head>
    <body>
        <input id = "list" type = "text" value = "1,2,3,4" />
        <input id = "num" type = "text" value = "2" />
        <input type = "button" value = "Add" onClick = "result.value = (new ArrayList(list.value)).add(num.value)" />
        <input type = "button" value = "Multiply" onClick = "result.value = (new ArrayList(list.value)).multiply(num.value)" />
        <br /><input type = "text" id = "result" />
    </body>
</html>

JS异常

try {
	var n = prompt("Please enter a positive number");
	var f = factorial(n);
	alert(n + "! = " + f);
} catch(ex) {
	if(ex instanceof NonePositiveError) {
		aoert(ex.message);
	} else {
		throw(ex);
	}
} finally {
	
}

function NonePositiveError(n) {
	n = n || "";
	this.message = "";
}

NonePositiveError.prototype = new Error();

function factorial(n) {
	n = parseInt(n);
	if(isNaN(n)) {
		throw(new TypeError());
	} else if(n <= 0) {
		throw(new NonePositiveError(n));
	} else {
		return n <= 1 ? 1 : n * factorial(n - 1);
	}
}

　　

posted @ 2014-05-14 21:33  sibeta  阅读(164)  评论(0)    收藏  举报