var name = '123';
var obj = {
name: '456'
}
Function.prototype.myCall = function(context) {
if (context === undefined || context === null) {
context = window;
}
context.fn = this;
const argu = [...arguments].slice(1);
const result = context.fn(...argu);
delete context.fn;
return result;
}
function tc() {
console.log(this.name)
}
tc()
tc.call(obj)
tc.myCall(obj)
