// 手写实现 call
Function.prototype.mCall = function(context) {
const ctx = context || window
ctx.func = this
const args = Array.from(arguments).slice(1)
const res = arguments.length > 1 ? ctx.func(...args) : ctx.func()
delete ctx.func
return res
}
Function.prototype.mApply = function(context) {
const ctx = context || window
ctx.func = this
const res = arguments[1]? ctx.func(...arguments[1]) : ctx.func()
delete ctx.func
return res
}
Function.prototype.mBind = function(context) {const ctx = JSON.parse(JSON.stringify(context)) || window
ctx.func = this
const args = Array.from(arguments).slice(1)
return function() {const Allargs = args.concat(Array.from(arguments))
return Allargs.length>0?ctx.func(...Allargs): ctx.func;
}
}
const obj = {getName: function() {console.log('原始。。。', this.name)
}
}
const nowObj = {name: 'js'}
// obj.getName.call(nowObj)
obj.getName.bind(nowObj)
console.log(obj)