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