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<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
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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);
}
} |