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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
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<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 = {
'<' : '<',
'>' : '>',
'&' : '&',
'"' : '"'
};
var _this = this;
return (function(){
return _this.replace(/[<>&"]/g,function(a){
return charactor[a]
})
})();
};
console.log( '<>&"'.entityfy() )
</script>
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