vue hello world项目
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3 years ago
'use strict';
var $ = require('../internals/export');
var global = require('../internals/global');
var uncurryThis = require('../internals/function-uncurry-this');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
var parseInt = require('../internals/number-parse-int');
var INVALID_NUMBER_REPRESENTATION = 'Invalid number representation';
var INVALID_RADIX = 'Invalid radix';
var RangeError = global.RangeError;
var SyntaxError = global.SyntaxError;
var TypeError = global.TypeError;
var valid = /^[\da-z]+$/;
var charAt = uncurryThis(''.charAt);
var exec = uncurryThis(valid.exec);
var numberToString = uncurryThis(1.0.toString);
var stringSlice = uncurryThis(''.slice);
// `Number.fromString` method
// https://github.com/tc39/proposal-number-fromstring
$({ target: 'Number', stat: true, forced: true }, {
fromString: function fromString(string, radix) {
var sign = 1;
var R, mathNum;
if (typeof string != 'string') throw TypeError(INVALID_NUMBER_REPRESENTATION);
if (!string.length) throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
if (charAt(string, 0) == '-') {
sign = -1;
string = stringSlice(string, 1);
if (!string.length) throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
}
R = radix === undefined ? 10 : toIntegerOrInfinity(radix);
if (R < 2 || R > 36) throw RangeError(INVALID_RADIX);
if (!exec(valid, string) || numberToString(mathNum = parseInt(string, R), R) !== string) {
throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
}
return sign * mathNum;
}
});