数据类型以及检测方式
this
function Foo() {
getName = function () {
console.log(1);
};
return this;
}
Foo.getName = function () {
console.log(2);
};
Foo.prototype.getName = function () {
console.log(3);
};
var getName = function () {
console.log(4);
};
function getName() {
console.log(5);
}
Foo.getName();
Foo().getName();
getName();
new Foo.getName();
new Foo().getName();
new new Foo().getName();
// 2 1 1 2 3 3
练习2:
function a(xx){
this.x = xx;
return this;
};
var x = a(5);
var y = a(6);
console.log(x.x);
console.log(y.x);
// undefined 6
练习3:
var length = 10;
function fn() {
console.log(this.length);
}
var obj = {
length: 5,
method: function(fn) {
fn();
arguments[0]();
}
};
obj.method(fn, 1);
// 10 2
