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String 是不能够作为Array传入map或者reduce吗

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用户tzrjiao630

#1 Created at ... [Delete] [Delete and Lock User] 
var b=[]
s.map(function(x){return b.push(x);})

报错如下

Uncaught TypeError: arr.map is not a function(…)

用户tzrjiao630

#2 Created at ... [Delete] [Delete and Lock User]

不知道有split这种函数哇。。。。很无奈
可以只用reduce和map解决第二题吗

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