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三种方法实现：获取 url 中的参数
source link: https://juejin.im/post/5b84bff9f265da437e4d86c9
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题目描述：获取 url 中的参数1. 指定参数名称，返回该参数的值 或者 空字符串；2. 不指定参数名称，返回全部的参数对象 或者 {}；3. 如果存在多个同名参数，则返回数组 ；题目来源(在线编辑)：www.nowcoder.com/practice/a3…
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