!function (proto) {
function getContext(context) {
context = context || window;
var type = typeof context;
if ([‘number‘, ‘string‘, ‘boolean‘, ‘null‘].includes(type)) {
context = new context.constructor(context);
}
return context;
}
function call(context, ...args) {
context = getContext(context);
context._fn = this;
let result = context._fn(...args);
delete context._fn;
return result;
}
function apply(context, args) {
context = getContext(context);
context._fn = this;
let result = context._fn(...args);
delete context._fn;
return result;
}
function bind(context, ...bindArgs) {
// this = getName
return (...args) => this.call(context, ...bindArgs, ...args);
}
proto.call = call;
proto.apply = apply;
proto.bind = bind;
}(Function.prototype)
function getName(age, home){
console.log(this.name, age, home);
}
let obj = {name: ‘xiao‘}
// getName.call(obj, 10, ‘gzhou‘)
// getName.apply(obj, [11, ‘shenzhen‘])
let bindFn = getName.bind(obj, 10)
bindFn(‘北京‘)
