js中的this关键字，setTimeout(),setInterval()的执行过程

var test1 = {
name: 'windseek1',
showname: function () {
console.log(this.name);
}
}
var test2 = {

name:'windseek2',
showname: test1.showname
}
test2.showname()
var test1 = {
name: 'windseek1',
showname: