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/**
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* 生成随机字符串
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* @param len 生成个数
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*/
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export const randomString = (len?: number) => {
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len = len || 10;
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const str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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const maxPos = str.length;
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let random_str = '';
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for (let i = 0; i < len; i++) {
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random_str += str.charAt(Math.floor(Math.random() * maxPos));
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}
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return random_str;
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};
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// 通过泛型定义通用类型保护函数
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export const isOfType = <T>(target: unknown, prop: keyof T): target is T => {
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return (target as T)[prop] !== undefined;
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};
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/**
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* 获取坐标偏移量
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* @param length 真实宽/高
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* @param scale 缩放倍数
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* @returns 坐标偏移量
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*/
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export const getCoordinateOffset = (length: number, scale: number) => {
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return (length / 2) * (scale - 1);
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};
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