zhanhongtao

// 函数声明
function _name() {
  //...
}

// 函数表达式
var _name = function() {
  //...
};

zhanhongtao

// 自执行函数
;(function() {
  //...
})();

// dom 绑定.
document.onclick = function () {
 // ....
};

zhanhongtao

// partial
;(function() {

  var BASE_FONT_SIZE = 100;
  var zoom = partial(function( a, b ) {
    return a + b;
  }, BASE_FONT_SIZE );

  var result = zoom( -30 );     // 70
  var result2 = zoom( 50 );     // 150

zhanhongtao

function type(s) {
    return Object.prototype.toString.call(s).slice(8,-1).toLowerCase();
}

console.assert( type( null ) == 'null', 'null' );
console.assert( type( undefined ) == 'undefined', 'undefined' );
console.assert( type( [] ) == 'array', '[]' );
console.assert( type( {} ) == 'object', 'object' );
console.assert( type( false ) == 'boolean', 'false' );
console.assert( type( 1.2 ) == 'number', '1.2' );

zhanhongtao

var result = 80;
var MAX_VALUE = 50;
var MIN_VALUE = 0;

// result 值不能小于 0
result = Math.max.call( Math, MIN_VALUE, result );

result = Math.min.apply( Math, [ MAX_VALUE, result ] );

console.log( result );

zhanhongtao

/*
  @return {object}
  {
    on: 开权限
    off: 取消权限
    done: 有权限时, 执行操作
  }
*/
function create( func, check, time ) {
  var flag = false;

zhanhongtao

    function removeDomByClass( classname ) {
      var boxes = document.getElementsByClassName( classname );
      for ( var i = 0, l = boxes.length; i < l; i++ ) {
        var box = boxes[0];
        if ( box && box.parentNode ) {
          box.parentNode.removeChild( box );
        }
      }
    }

zhanhongtao

var type = function(s) {
    return Object.prototype.toString.call(s).slice(8,-1).toLowerCase();
};

var log = function() {
  var color = 'background: #000;color: yellow;padding: 0 3px';
  var string = '%c';//'%c';
  for ( var i = 0, l = arguments.length; i < l; i++ ) {
      var t = type(arguments[i]);
      switch(t) {

zhanhongtao

var f;
f = function ( n ) {
    if ( n === 0 ) return 0;
    else 
        return n + f(n-1);
};

var a = f(3);
console.log( 'a: ', a );

zhanhongtao

var a = [ 1, 2, 3 ];

function change( a, i, j) {
   var t = a[i];
   a[i] = a[j];
   a[j] = t;
}

function permgen( a, n ) {
   n = n == null ? a.length : n;