<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
function sum(a,b){
var rescroe= a+b;
return rescroe;
}
var c=sum(1,2);
console.log(c);
function args() { return arguments; } //函数内建arguments数组
console.log(args());
console.log( args(1,2,3,'adc',true));
function sumonescreat() {
var i, res=0;
var number_of_arguments=arguments.length;
for(i= 0 ; i<number_of_arguments; i++){
res+=arguments[i];
};
return res;
}
console.log(sumonescreat(1,2,3,4,5));
var parstr=parseInt('124'); //parseInt转为整数
console.log(parstr);
var goa=123; //全局变量
function f(){ //f函数
console.log(goa); //undefined
var goa=23;
console.log(goa); //23
}
f();
var desun=function(a,b){ return a+b };
var add=desun;
delete desun;
console.log(typeof desun);
console.log(add(1,2))
function intel_add_and(a,b) {
return a()+b();
}
function anum(){
return 12;
}
function bnum() {
return 13;
}
console.log(intel_add_and(anum,bnum));
function callfun(a,b,c,callback) {
var i,rec=[];
for(i=0; i<3; i++){
rec[i]=callback(arguments[i]*2);
}
return rec;
}
function addfun(d){
return d+1;
}
var mycall=callfun(1,2,3,addfun);
console.log(mycall); //[357]
var a=function(){
// alert('fdsaf'); //自调函数
function somesetup( ) {
var setup='doen';
}
function autowork( ) {
console.log('worker');
}
somesetup();
return autowork();
}();
//作用域
var zuo=1; function f(){var zuoa=12; return zuo;}
// console.log(f(),zuoa); 1, zuoa is not defined;
console.log(f());
var zuo_a=123;
function zuo_fun() {
var zuo_b=124;
function n() {
var zuo_c=125;
}
}
function fung() {
var fung_b='b';
return function(){
return fung_b;
}
}
var funh=fung();
console.log(funh());
var n; //定义一个全局变量n；
function fun_n() { //在fun_n函数里调用n();
var fun_a='a';
n=function() {
return fun_a;
}
}
fun_n();
n();
console.log(n());
var funN;
function fun_argu(argus) {
var funN=function () {
return argus;
};
argus++;
return funN;
}
var myargus=fun_argu(145);
console.log(myargus());
function fun_arr() {
var a=[];
var i;
for (var i = 0; i < 3; i++) {
a[i]=function(){
return i;
}
}
return a;
}
var a=fun_arr();
console.log(a[0](),a[1](),a[2]()); //3，3，3；
function fun_arr2() {
var c=[];
var i;
for (var i =0; i < 3; i++) {
c[i]=(function(x){
return function(){
return x;
}
})(i);
}
return c;
}
var c=fun_arr2();
console.log(c[0](),c[1](),c[2]()); //0 1 2
function fun_arr3() {
function makeClosure(x) {
return function() {
return x;
}
}
var d=[];
var i;
for (var i =0; i < 3; i++) {
d[i]=makeClosure(i)
}
return d;
}
var d=fun_arr3();
console.log(d[0](),d[1](),d[2]()); // 0 1 2;
//setValue,getValue;
var setValue,getValue;
(function(){
var set_value=0;
getValue=function() {
return set_value;
}
setValue=function (v) {
set_value=v;
}
})();
getValue();
console.log(getValue()); //0
setValue(1212);
getValue();
console.log(getValue()); //1212
//迭代
function setup(x) {
var i=0;
return function() {
return x[i++];
};
}
var next_world=setup(['a','b','c','d','e']);
console.log(next_world(),next_world(),next_world(),next_world(),next_world());
//十六进制值转为颜色函数getRGB()
function getRGB(hex){
var rgb=[0,0,0];
if(/#(..)(..)(..)/g.test(hex)){
rgb=[parseInt(RegExp.$1,16),parseInt(RegExp.$2,16),parseInt(RegExp.$3,16)];
};
return "rgb("+rgb.join(",")+")";
}
getRGB('#00ff00'); //"rgb(0,255,0)"
var xa=1;
function fxa() {
var xa=2;
function xn() {
alert(xa); // body...
}
xn();
}
fxa(); //返回2
</script>
</head>
<body>
</body>
</html>
