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wenzhixin/pad.js

Last active August 29, 2015 13:59
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pad.js
function pad(len, num) {
return (new Array(len + 1).join('0') + num).slice(-len);
}
pad(2, 1); // 01
pad(2, 11); // 11
pad(10, 12345); // 0000012345
pad(10, 12345678); // 0012345678
pad(10, 1234567890); // 1234567890
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