Javascript小技巧：用0填充二进制数字

var answer = parseInt(question.answer, 10).toString(2);
var answerStr = '0000'.substring(0, 8 - answer.length) + answer;

1 2	var answer = parseInt(question.answer, 10).toString(2); var answerStr = '0000'.substring(0, 8 - answer.length) + answer;

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