jinsong5
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jinsong5
## 来个ES5的 ``` var currying = function (fn) { if (typeof fn !== 'function') { return new Error('need function') } var args = [] return function doCurrying() { if (arguments.length...
5 变量引用会沿着作用域链去查找，todo()()之后改变的是todo作用域内部的a的值，由9变成7，console时候输出的是window下的a，所以还是5