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- var toValString = require('./toString')
- /**
- * 判断字符串是否在源字符串的头部
- *
- * @param {String} str 字符串
- * @param {String/Number} val 值
- * @param {Number} startIndex 开始索引
- * @return {String}
- */
- function startsWith (str, val, startIndex) {
- var rest = toValString(str)
- return (arguments.length === 1 ? rest : rest.substring(startIndex)).indexOf(val) === 0
- }
- module.exports = startsWith
|
