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6.call.js
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6.call.js
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// https://github.com/mqyqingfeng/Blog/issues/11
/**
*
* @param {*} ctx 函数执行上下文this
* @param {...any} args 参数列表
* @returns 函数执行的结果
*/
Function.prototype.myCall = function (ctx, ...args) {
if (!ctx) {
ctx = typeof window !== 'undefined' ? window : global
}
// 暴露处理 ctx有可能传非对象
ctx = Object(ctx)
const fnName = Symbol('key')
ctx[ fnName ] = this
const result = ctx[ fnName ](...args)
delete ctx[ fnName ]
return result
}
let fn = function (name, sex) {
console.log(this, name, sex)
}
fn.myCall('', '前端胖头鱼', 'boy'),
fn.myCall({ name: '前端胖头鱼', sex: 'boy' }, '前端胖头鱼', 'boy')