| 1 | "use strict";
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| 2 | function rdNum(min, max, border) {
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| 3 | if (min === max) {
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| 4 | return 'rdNum() 边界值不合理';
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| 5 | }
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| 6 | var range = max - min;
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| 7 | var random = Math.random();
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| 8 | switch (border) {
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| 9 | case 'left':
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| 10 | return min + Math.floor(random * range);
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| 11 | case 'right':
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| 12 | if (random === 0) {
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| 13 | random = 1;
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| 14 | }
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| 15 | return min + Math.ceil(random * range);
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| 16 | case 'no':
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| 17 | if ((max - min < 1) || (max - min) === 1)
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| 18 | return 'rdNum() 边界值不合理';
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| 19 | if (random === 0) {
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| 20 | random = 1;
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| 21 | }
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| 22 | return min + Math.ceil(random * (range - 1));
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| 23 | default:
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| 24 | return min + Math.round(random * range);
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| 25 | }
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| 26 | }
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| 27 | module.exports = rdNum;
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| 28 | |
| \ | No newline at end of file |