Hi, all:
I met something wierd when I reading the latest json.js.
look at the code segment.
especially notice the "START HERE" and "END HERE" place...
(function () { // <-------------------------- START HERE
var m = {
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"' : '\\"',
'\\': '\\\\'
},
s = {
array: function (x) {
var a = ['['], b, f, i, l = x.length, v;
for (i = 0; i < l; i += 1) {
v = x[i];
f = s[typeof v];
if (f) {
v = f(v);
if (typeof v == 'string') {
if (b) {
a[a.length] = ',';
}
a[a.length] = v;
b = true;
}
}
}
a[a.length] = ']';
return a.join('');
},
'boolean': function (x) {
return String(x);
},
'null': function (x) {
return "null";
},
number: function (x) {
return isFinite(x) ? String(x) : 'null';
},
object: function (x) {
if (x) {
if (x instanceof Array) {
return s.array(x);
}
var a = ['{'], b, f, i, v;
for (i in x) {
v = x[i];
f = s[typeof v];
if (f) {
v = f(v);
if (typeof v == 'string') {
if (b) {
a[a.length] = ',';
}
a.push(s.string (i), ':', v);
b = true;
}
}
}
a[a.length] = '}';
return a.join('');
}
return 'null';
},
string: function (x) {
if (/["\\\x00-\x1f]/.test(x)) {
x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
var c = m[b];
if (c) {
return c;
}
c = b.charCodeAt();
return '\\u00' +
Math.floor(c / 16).toString(16 ) +
(c % 16).toString(16 );
});
}
return '"' + x + '"';
}
};
Object.prototyp e.toJSONString = function () {
return s.object(this);
};
Array.prototype .toJSONString = function () {
return s.array(this);
};
})(); // <-------------------------- END HERE
Why there is a bracket outside the anonymous function?
I have did a quick browse of ECMA-262.pdf, but did not find what I want
to know.
A search for bracket will not get any useful result.
Thank you all! 2 1206
Sun Liwen wrote:
<snip>
(function () { // <-------------------------- START HERE
<snip>
})(); // <-------------------------- END HERE
Why there is a bracket outside the anonymous function?
The whole is an ExpressionState ment. ExpressionState ments are explicitly
forbidden from starting with - function -, else they could not be
distinguished from FunctionDeclara tions. The first set of parentheses
around the anonymous function expression ensure that it cannot be
interpreted as a Function Declaration, the final pair of parentheses are
call operators and call the value of the Expression to their left (the
parenthesised anonymous function expression, for which the value is a
reference to a function object).
I have did a quick browse of ECMA-262.pdf, but did not
find what I want to know.
A search for bracket will not get any useful result.
A search for function would have found the restriction on the
ExpressionState ment production.
Richard.
Got it!
Thank you for your explanation! This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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