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用js截掉url参数后面第四个&字符之后的内容

用js截掉url参数后面低四个&字符之后的内容,有什么好的方法吗


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> '11111?aa=aa&bb=bb&cc=dd&ee=ee&ff=ff'.split('&').slice(0,4).join('&')
< "11111?aa=aa&bb=bb&cc=dd&ee=ee"

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