silianlinyi

var hasStrictMode = (function() {
	"use strict";
	return this === undefined;
}());

silianlinyi

/**
 * Person类（父类）
 */
function Person(name, age) {
    this.name = name;
    this.age = age;
}

Person.prototype.getName = function() {
    return this.name;

silianlinyi

var walkTheDOM = function walk(node, func) {
	func(node);
	node = node.firstChild;
	while(node) {
		walk(node, func);
		node = node.nextSibling;
	}
}

silianlinyi

function getElementsByAttribute(att, value) {
	var results = [];
	
	iterateDOM(document.body, function(node) {
		var actual = node.nodeType === 1 && node.getAttribute(att);
		if(typeof actual === 'string' && (actual === value || typeof value !== 'string')) {
			results.push(node);
		}
	});
	

silianlinyi

function factorial(i, a) {
	a = a || 1;
	if(i < 2) {
		return a;
	}
	return factorial(i - 1, a * i);
}

factorial(4); // => 24

silianlinyi

var fibonacci = function() {
    var memo = [0, 1];
    var fib = function(n) {
        var result = memo[n];
        if(typeof result !== 'number') {
            result = fib(n - 1) + fib(n - 2);
            memo[n] = result;
        }
        return result;
    };

silianlinyi

var memoizer = function(memo, formula) {
    var recur = function(n) {
        var result = memo[n];
        if(typeof result !== 'number') {
            result = formula(recur, n);
            memo[n] = result;
        }
        return result;
    };
    return recur;

silianlinyi

<canvas width="300" height="300" id="test"></canvas>
<script type="text/javascript">
    var canvas = document.getElementById('test');
    var ctx = canvas.getContext('2d');

    //绘制螺旋图案的函数
    function drawSpirograph(ctx,R,r,O){
        var x1 = R-O;
        var y1 = 0;
        var i = 1;

silianlinyi

function ramdom(min, max) {
	if (max == null) {
		max = min;
		min = 0;
	}
	return min + Math.floor(Math.random() * (max - min + 1));
}

silianlinyi

function generateRandomAlphaNum(len) {  
	var rdmString = "";
	for( ; rdmString.length < len; rdmString  += Math.random().toString(36).substr(2));
	return  rdmString.substr(0, len);
}