lib/polyfill.js
(function (global) {
var oProto = Object.prototype;
var toString = oProto.toString;
var hasOwnProperty = oProto.hasOwnProperty;
function needFix(fn) {
return !/native code/.test(fn);
}
//修复 console
if (!global.console) {
global.console = {};
}
var con = global.console; //有的浏览器拥有console对象，但没有这么多方法
var prop, method;
var dummy = function () { };
var properties = ["memory"];
var methods = ("assert,clear,count,debug,dir,dirxml,error,exception,group,groupCollapsed,groupEn" +
"d,info,log,markTimeline,profile,profiles,profileEnd,show,table,time,timeEnd,time" +
"line,timelineEnd,timeStamp,trace,warn").split(",");
while ((prop = properties.pop())) {
if (!con[prop]) {
con[prop] = {};
}
}
while ((method = methods.pop())) {
if (!con[method]) {
con[method] = dummy;
}
}
// 修复console完毕！
//https://github.com/flowersinthesand/stringifyJSON/blob/master/stringifyjson.js
function quote(string) {
return (
"\"" +
string.replace(escapable, function (a) {
var c = meta[a];
return typeof c === "string"
? c
: "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
}) +
"\""
);
}
function f(n) {
return n < 10 ? "0" + n : n;
}
function str(key, holder) {
var i,
v,
len,
partial,
value = holder[key],
type = typeof value;
if (
value &&
typeof value === "object" &&
typeof value.toJSON === "function"
) {
value = value.toJSON(key);
type = typeof value;
}
switch (type) {
case "string":
return quote(value);
case "number":
return isFinite(value) ? String(value) : "null";
case "boolean":
return String(value);
case "object":
if (!value) {
return "null";
}
switch (toString.call(value)) {
case "[object Date]":
return isFinite(value.valueOf())
? "\"" +
value.getUTCFullYear() +
"-" +
f(value.getUTCMonth() + 1) +
"-" +
f(value.getUTCDate()) +
"T" +
f(value.getUTCHours()) +
":" +
f(value.getUTCMinutes()) +
":" +
f(value.getUTCSeconds()) +
"Z\""
: "null";
case "[object Array]":
len = value.length;
partial = [];
for (i = 0; i < len; i++) {
partial.push(str(i, value) || "null");
}
return "[" + partial.join(",") + "]";
default:
partial = [];
for (i in value) {
if (hasOwnProperty.call(value, i)) {
v = str(i, value);
if (v) {
partial.push(quote(i) + ":" + v);
}
}
}
return "{" + partial.join(",") + "}";
}
}
}
if (typeof JSON === "undefined") {
var escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
meta = {
"\b": "\\b",
"\t": "\\t",
"\n": "\\n",
"\f": "\\f",
"\r": "\\r",
"\"": "\\\"",
"\\": "\\\\"
};
global.JSON = {
stringify: function (value) {
return str("", { "": value });
},
//http://www.cnblogs.com/fengzekun/p/3940918.html
parse: function () {
return new Function("return " + data)();
}
};
}
//支持 Function.prototype.bind
var fProto = Function.prototype;
if (needFix(fProto.bind)) {
fProto.bind = function () {
var fn = this;
var presetArgs = [].slice.call(arguments);
var context = presetArgs.shift();
var curry = function () {
for (var i = 0, n = arguments.length; i < n; i++) {
presetArgs.push(arguments[i]);
}
return fn.apply(context, presetArgs);
};
curry.name = "bound " + (fn.name || "anonymous");
return curry;
};
}
//修正 Array.prototype.splice
var arrayProto = Array.prototype;
if (0 === [1, 2].splice(0).length) {
var _splice = arrayProto.splice;
arrayProto.splice = function (a) {
var args = arrayProto.slice.call(arguments);
if (typeof args[1] !== "number") {
//IE6－8只能重写已经存在的索引值。比如aaa(1,2,3)，只有三个参数，不能以arguments[3] =88来添加第4个参数
args[1] = this.length;
}
return _splice.apply(this, args);
};
}
//支持 Array.prototype.forEach
if (needFix(arrayProto.forEach)) {
arrayProto.forEach = function (callback, thisArg) {
var array = this;
for (var i = 0, n = array.length; i < n; i++) {
if (i in array) {
callback.call(thisArg, array[i], i, array);
}
}
};
}
if (needFix(arrayProto.indexOf)) {
arrayProto.indexOf = function (searchElement, fromIndex) {
if ( this === undefined || this === null ) {
throw new TypeError( '"this" is null or not defined' );
}
var length = this.length >>> 0; // Hack to convert object.length to a UInt32
fromIndex = +fromIndex || 0;
if (Math.abs(fromIndex) === Infinity) {
fromIndex = 0;
}
if (fromIndex < 0) {
fromIndex += length;
if (fromIndex < 0) {
fromIndex = 0;
}
}
for (; fromIndex < length; fromIndex++) {
if (this[fromIndex] === searchElement) {
return fromIndex;
}
}
return -1;
};
}
if(!String.prototype.trim){
String.prototype.trim = function(a){
return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
}
}
//支持 Array.isArray
if (needFix(Array.isArray)) {
Array.isArray = function (arr) {
return toString.call(arr) == "[object Array]";
};
}
//支持 Object.is
if (needFix(Object.is)) {
Object.is = function is(x, y) {
if (x === y) {
// Steps 1-5, 7-10 Steps 6.b-6.e: +0 != -0 Added the nonzero y check to make
// Flow happy, but it is redundant
return x !== 0 || y !== 0 || 1 / x === 1 / y;
} else {
// Step 6.a: NaN == NaN
return x !== x && y !== y;
}
};
}
if (needFix(Object.create)) {
Object.create = function (o) {
function F() { }
F.prototype = o;
return new F();
};
}
//支持 Object.assign
if (needFix(Object.assign)) {
Object.assign = function (target) {
if (target === undefined || target === null) {
throw new TypeError("Cannot convert undefined or null to object");
}
var output = Object(target);
for (var index = 1; index < arguments.length; index++) {
var source = arguments[index];
if (source !== undefined && source !== null) {
for (var nextKey in source) {
if (hasOwnProperty.call(source,nextKey)) {
output[nextKey] = source[nextKey];
}
}
}
}
return output;
};
}
if (needFix(Object.keys)) {
var hasDontEnumBug = !{ toString: null }.propertyIsEnumerable("toString");
var dontEnums = [
"toString",
"toLocaleString",
"valueOf",
"hasOwnProperty",
"isPrototypeOf",
"propertyIsEnumerable",
"constructor"
];
Object.keys = function (obj) {
if (Object(obj) !== obj) {
throw new TypeError("Object.keys called on non-object");
}
var result = [],
prop,
i;
for (prop in obj) {
if (hasOwnProperty.call(obj, prop)) {
result.push(prop);
}
}
if (hasDontEnumBug) {
for (i = 0; i < 7; i++) {
if (hasOwnProperty.call(obj, dontEnums[i])) {
result.push(dontEnums[i]);
}
}
}
return result;
};
}
})(typeof window === "undefined" ? this : window);