JS 手写 bind( )
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<script>
Function.prototype.myBind = function (thisArg) {
var _this = this;
var argArr = Array.from(arguments).slice(1);
return function () {
return _this.apply(thisArg, argArr);
}
}
var obj = {
name: "laowang"
}
function fn(a, b) {
console.log(this, a + b)
return "hello"
}
var reFn1 = fn.bind(obj, 1, 2);
console.log(reFn1())
var reFn2 = fn.myBind(obj, 1, 2);
console.log(reFn2());
</script>
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