object literal

var myObject = { name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', level: 3, "3": "three" };
alert(myObject.name);
alert(myObject["name"]);
alert(myObject["goto"]);
alert(myObject.goto); //ok
alert(myObject["3"]);
//alert(myObject.3); //error

function overload

function.length can tell you the number of parameters defined, using this we can create overload functions

later method

Object.prototype.later = function (msec, method) {
    var context = this,
    args = Array.prototype.slice.apply(arguments, [2]); 
    if (typeof method === 'string') { 
        method = context[method]; 
    } 
    setTimeout(function () { 
        method.apply(context, args); 
    }, msec); 
    return context; 
}; 

fixed a closure bug

Closure refer the ability that a function can access and manipulate external variable from with a function. Sometimes, this is not good because the if a function depends on the external state. When the external state changes, the function may produce unexpected result.

efficency string operation

Because string is immutable in JavaScript, concatenation with array.join('') is much efficient. The following code use all the chinese characters. Click here to show