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59 lines
1.2 KiB
59 lines
1.2 KiB
/**
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* 字符串方法的扩展
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*
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* @author lautin
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* @created 2019-11-22 15:24:20
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*/
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/**
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* 生成一组随机值的方法，用于上传文件名等场景
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* @param {number} len
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*/
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function random(count = null) {
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let len = count || 32,
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$chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678',
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ret = '',
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time = new Date().getTime().toString();
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if (len / 2 > time.length) {
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// 控制总长度不超出
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len = len - time.length
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} else {
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len = len / 2
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}
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for (let i = 0; i < len; i++) {
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ret += $chars.charAt(Math.floor(Math.random() * $chars.length))
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if (time[i]) {
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ret += time[time.length - i - 1]
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}
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}
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return ret;
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}
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/**
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* 截取字符串之前之后
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* @param {string} str
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* @param {string} targe
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* @param {number} index
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*/
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function getCaptionLength(str, targe, index) {
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if (!index) {
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return str.substring(0, str.indexOf(targe))
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} else {
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return str.substring(str.lastIndexOf(targe) + 1)
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}
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}
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// 绑定为静态方法
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Object.assign(String, {
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random,
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getCaptionLength
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});
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// fontcolor设置别名
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String.prototype.color = Object.prototype.fontcolor;
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export default {
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random,
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getCaptionLength
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}
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