keep_on _coding——js_good_parts

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script>
function add(a,b){
    return Number(a) + Number(b);
};
var arr = [1,2,3,4,5,6,7,8,9,10];
Array.prototype.reduce_self = function(f,value){
    var i;
    
    for(i = 0; i<this.length; i+=1){
        value = f( this[i] , value )
    };
    return value;
};

Array.prototype.dim = function(n,init){
    var a = [] , i;
    for(i = 0; i < n; i+=1){
        a[i] = init
    };
    return a;
};

Array.prototype.matrix = function(m,n,initial){
    var a, i, j, mat = [];
    for(i=0; i<m; i+=1){
        a = [];
        for(j=0; j<n; j++){
            a[j] = initial;
        };
        mat[i] = a;
    }
    return mat;
};

//RegExp
var parse_url = /^(?:([a-zA-z]+):)?(/{0,3})([0-9.-a-zA-Z]+)(?::(d+))?/;
var url = "http://www.chenqihao.com:80/goodparts?q#fragment";
var result = parse_url.exec(url);

var names = ['url','scheme','slash','host','port'];
var blanks = '         ', i ;
for(i=0; i<names.length; i+=1){
    document.writeln(names[i] + ':' + result[i] + '<br>')
};

//排序
var arr = [2,1,3,66,10,200,28,29];
arr.sort();
console.log(arr)
arr.sort(function(a,b){
    if(a<b){
        return 1
    }else{
        return  -1
    }
});
console.log(arr);

var arr1 = [10,29,'ddd',100,'bbd',29,0,18,'a',18,'b'];
arr1.sort(function(a,b){
    if( a === b){
        return 0;
    }
    if( typeof a == 'number' && typeof b == 'number' ){
        if(a < b){return -1}else{ return 1};
    };
    if( typeof a < typeof b){
        return -1
    };
});

var by = function(name){
    return function(a,b){
        var c,d;
        if(typeof a === 'object' && typeof b === 'object' && a && b){
            c = a [name],d = b[name];
            if(a === b){
                return 0
            };
            if( typeof a === typeof b ){
                return a < b ? -1 : 1;
            };
            return typeof a < typeof b ? -1 : 1;
        };
    };
};
var obj = [
    {f : 'C'},
    {f : 'E'},
    {f : 'B'},
    {f : 'A'},
    {f : 'S'}
];
obj.sort( by('f') );
console.log( JSON.stringify(obj) );

var arr = ['a','b','c','d'];
arr._unshift = function(){
    this.splice.apply(this,[0,0].concat(Array.prototype.slice.call(arguments)))
};
//Array.prototype.slice.call(arguments) 可以将类数组转换为真数组

Function.prototype._bind = function(that){
    var method = this,
        slice = Array.prototype.slice,
        args = slice.apply(arguments,[1]);
        return function(){
            method.apply( that,args.concat(slice.apply(arguments,[0])) )
        };
};

//下面这个东东，经常服务器返回东西经过编码了，用这个在转下；反正转来转去的
/* 主要是这四个字符  < > & "  */
String.prototype.entityfy = function(){
    var charactor = {
        '<' : '&lt;',
        '>' : '&gt;',
        '&' : '&amp;',
        '"' : '&quot;'
    };
    var _this = this;
    return (function(){
        return _this.replace(/[<>&"]/g,function(a){
            return charactor[a]
        })    
    })();
};
console.log( '<>&"'.entityfy() )
</script>
</body>
</html>
keep_on _coding——js_good_parts

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