有时候使用doFunc({arg1: xxx, arg2:xxx});不方便，还是得在参数表重载，而重载情况又多种多样弄得晕头转向，结果就试着写了这么个东西，也不知道有没有地方能用上：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>命名空间、参数类型重载</title>
<script type="text/javascript" src="arg-func.js"></script>
<script type="text/javascript">
(function () {
var MyFuncs = {
‘myNamespace.exampleFunc(string str, number num)‘: function (str, num) {
alert(‘str: ‘ + str + ‘ num: ‘ + num);
},
‘myNamespace.exampleFunc(number num)‘: function (num) {
alert(‘num: ‘ + num);
},
‘myNamespace.exampleFunc(array)‘: function (arr) {
alert(‘arr: ‘ + arr);
},
‘myNamespace.exampleFunc()‘: function () {
alert(‘无参数重载‘);
}
};
ArgFunc.parse(MyFuncs);
})();
</script>
</head>
<body>
<label>有效调用：</label><br />
<input type="button" value="myNamespace.exampleFunc(‘abc‘,123)" onclick="myNamespace.exampleFunc(‘abc‘, 123)" /><br />
<input type="button" value="myNamespace.exampleFunc(123)" onclick="myNamespace.exampleFunc(123)" /><br />
<input type="button" value="myNamespace.exampleFunc([1,2,3])" onclick="myNamespace.exampleFunc([1, 2, 3])" /><br />
<input type="button" value="myNamespace.exampleFunc()" onclick="myNamespace.exampleFunc()" /><br />
<label>无效调用：</label><br />
<input type="button" value="myNamespace.exampleFunc(false)" onclick="myNamespace.exampleFunc(false)" /><br />
<input type="button" value="myNamespace.exampleFunc(‘abc‘,123,[1,2,3])" onclick="myNamespace.exampleFunc(‘abc‘, 123, [1, 2, 3])" /><br />
</body>
</html>
用到的arg-func.js：
(function () {
if (!String.prototype.trim) {
String.prototype.trim = function () {
return this.replace(/(^\s+)|(\s+$)/g, ‘‘);
};
}
var TYPE = { UNKOWN: null, UNDEFINED: ‘undefined‘, NULL: ‘null‘, BOOLEAN: ‘boolean‘, NUMBER: ‘number‘, STRING: ‘string‘, FUNCTION: ‘function‘, OBJECT: ‘object‘, ARRAY: ‘array‘ };
function getType(o) {
if (o === undefined) { return TYPE.UNDEFINED; }
if (o === null) { return TYPE.NULL; }
switch (typeof (o)) {
case TYPE.BOOLEAN: return TYPE.BOOLEAN;
case TYPE.NUMBER: return TYPE.NUMBER;
case TYPE.STRING: return TYPE.STRING;
case TYPE.FUNCTION: return TYPE.FUNCTION;
}
switch (Object.prototype.toString.call(o)) {
case ‘[object Array]‘: return TYPE.ARRAY;
case ‘[object Object]‘: return TYPE.OBJECT;
default: return o ? TYPE.OBJECT : TYPE.UNKOWN;
}
}
var _ArgFunc = {
_parse: function (format, func, namespace) {
var lp = format.indexOf(‘(‘), rp = format.indexOf(‘)‘);
var name = format.substring(0, lp);
var argTypes = format.substring(lp + 1, rp).split(‘,‘);
for (var i = 0, len = argTypes.length; i < len; i++) {
argTypes[i] = argTypes[i].trim().split(/ +/)[0];
}
argTypes = argTypes.join(‘,‘);
var nsnn = _ArgFunc._analyseNamespace(name, namespace);
namespace = nsnn.namespace;
name = nsnn.name;
var wrapperFunc = namespace[name];
if (!wrapperFunc) {
wrapperFunc = namespace[name] = function () {
ArgFunc.apply(wrapperFunc, arguments);
};
}
if (wrapperFunc[argTypes]) {
throw ‘方法已存在参数类型一样的重载。‘;
} else {
wrapperFunc[argTypes] = func;
}
},
_analyseNamespace: function (name, upperNamespace) {
var namespace = upperNamespace || window;
var parts = name.split(‘.‘);
var name = parts.pop();
for (var i = 0, part; part = parts[i]; i++) {
if (!namespace[part]) {
namespace[part] = {};
}
namespace = namespace[part];
}
return { namespace: namespace, name: name };
}
};
var ArgFunc = {
bind: function (funcs, prototype) {
ArgFunc.parse(funcs, prototype);
},
parse: function (funcs, namespace) {
if (arguments.length == 3) {
_ArgFunc._parse(arguments[0], arguments[1], arguments[2]);
} else if (getType(funcs) == TYPE.OBJECT) {
for (var format in funcs) {
_ArgFunc._parse(format, funcs[format], namespace);
}
} else if (getType(funcs) = TYPE.ARRAY) {
for (var i = 0, func; func = funcs[i]; i++) {
_ArgFunc._parse(func[0], func[1], namespace);
}
}
},
apply: function (func, args) {
var argTypes = [];
for (var i = 0, len = args.length; i < len; i++) {
var arg = args[i];
argTypes.push(getType(arg));
}
argTypes = argTypes.join(‘,‘);
func = func[argTypes];
if (!func) {
throw ‘没有找到参数类型匹配的重载方法‘;
} else {
func.apply(this, args);
}
}
};
if (!window[‘ArgFunc‘]) {
window[‘ArgFunc‘] = ArgFunc;
}
})();
时间： 2024-12-11 02:00:43