33 lines
933 B
JavaScript
33 lines
933 B
JavaScript
var toValueString = require('./toValueString')
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var isUndefined = require('./isUndefined')
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var helperStringRepeat = require('./helperStringRepeat')
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/**
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* 用指定字符从后面开始补全字符串
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*
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* @param {String} str 字符串
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* @param {Number} targetLength 结果长度
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* @param {Number} padString 补全字符
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* @return {String}
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*/
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function padEnd (str, targetLength, padString) {
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var rest = toValueString(str)
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targetLength = targetLength >> 0
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padString = isUndefined(padString) ? ' ' : '' + padString
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if (rest.padEnd) {
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return rest.padEnd(targetLength, padString)
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}
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if (targetLength > rest.length) {
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targetLength -= rest.length
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if (targetLength > padString.length) {
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padString += helperStringRepeat(padString, targetLength / padString.length)
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}
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return rest + padString.slice(0, targetLength)
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}
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return rest
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}
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module.exports = padEnd
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