JS中的对象都包含valueOf方法,我们可以通过自定义valueOf函数替换掉原始object的valueOf
function foo() {
this.valueOf = function() {
return 'this is my value';
}
}
var bar = new foo();
Print( bar ); // prints: this is my value
Print( bar == 'this is my value' ) // prints: true
// http://www.75271.com
Print( bar === 'this is my value' ) // prints: false
