var jane = {
hoho: ‘Jane‘,
describe: function() {
return ‘Person named ‘ + this.hoho;
}
};
var fun = jane.describe; // this 是全局window
console.log(fun());
var func2 = jane.describe.bind(jane); //this是jane 即作用域绑定
console.log(func2());
原文：http://www.cnblogs.com/lcw5945/p/4330634.html