前端调试技巧
1.console.log
console.log(test()); // 1 delete test; console.log(typeof test); // undefined
2.eval
var GLOBAL_OBJECT = this; /* `foo` is created as a property of calling context Variable object, which in this case is a Global object */ eval('var foo = 1;'); GLOBAL_OBJECT.foo; // 1
3.delete 操作符
var o = { x: 1 }; delete o.x; // true o.x; // undefined
http://www.cnblogs.com/jscode/archive/2012/09/02/2667464.html