修改this的指向

call()、bind()、apply()的用法，改变this的指向，区别在于
f.call(obj, arg1, arg2...),
f.bind(obj, arg1, arg2,...)(),
f.apply(obj, [arg1, arg2, .])

1. apply  

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   function bindThis(f, oTarget) {  return function() {      return f.apply(oTarget, arguments)  } }

2. bind  

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   function bindThis(f, oTarget) {  return f.bind(oTarget) }

3. call  

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   function bindThis(f, oTarget) {  return function() {      return f.call(oTarget, ...arguments)  } }

标签：function,return,指向,bind,修改,call,oTarget,apply
来源： https://www.cnblogs.com/laoli-boke/p/15134005.html