mirror of https://github.com/jkjoy/sunpeiwen.git
24 lines
741 B
JavaScript
24 lines
741 B
JavaScript
// getting tag from 19.1.3.6 Object.prototype.toString()
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var cof = require('./_cof');
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var TAG = require('./_wks')('toStringTag');
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// ES3 wrong here
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var ARG = cof(function () { return arguments; }()) == 'Arguments';
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// fallback for IE11 Script Access Denied error
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var tryGet = function (it, key) {
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try {
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return it[key];
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} catch (e) { /* empty */ }
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};
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module.exports = function (it) {
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var O, T, B;
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return it === undefined ? 'Undefined' : it === null ? 'Null'
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// @@toStringTag case
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: typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T
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// builtinTag case
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: ARG ? cof(O)
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// ES3 arguments fallback
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: (B = cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;
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};
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