function print(txt) {
document.getElementById("container").innerHTML += ('\n') + txt;
}
console.log = print;
console.log("hello")
function fact(num) {
if (num <= 1) {
return 1;
}
return num * arguments.callee(num - 1);
}
print(fact(5))
window.color = "red";
function getColor() {
print(this.color);
}
getColor();// red
var obj = {color: "blue"};
print("------call---------")
getColor.call(this); //red
getColor.call(window); //red
getColor.call(obj); //blue
getColor.apply(this) //red
getColor.apply(obj) //blue
print('----bind------')
var ofun = getColor.bind(obj);
ofun();//blue
obj.showColor = getColor;
obj.showColor();// blue,this即当前调用该方法的对象，即：obj
function outer() {
inner();
}
function inner() {
print("主调函数：" + arguments.callee.caller);
}
outer();
function fun(p1, p2, p3, p4) {
}
print(fun.length)
var s1 = "abcd";//基本类型
s1.name = "abc";
print(s1.name);
var s2 = new String("abcd");//包装类型
s2.name = "abc";
print(s2.name)
print('------boolean-----')
print(new Boolean(false) && true)//true 对象是true
print(false && true) //false
print(typeof new Boolean(false)); //object
print(typeof new Boolean(true));//object
print(typeof true);//boolean
print(typeof false);//boolean
print(new Boolean(true) instanceof Boolean);//true
print(true instanceof Boolean);//false
print(0xff.toString(2))//11111111
print(0xff.toString(8))//377
print(0xff.toString(10))// 255
print(12.345.toFixed(2))//12.35
print(10.234.toExponential(5))//1.02340e+1
print(10.235.toExponential(2))//1.02e+1
print('------string-------')
print("hello".charAt(0))//h
print("hello".charCodeAt(0));//104
print("hello"[0])//h
print("hello".concat(" world"," !"))//hello world !
var hello="hello world !";
print(hello.slice(3))//lo world !
print(hello.substring(3))//lo world !
print(hello.substr(3))//lo world !
print(hello.slice(3,7))//lo w
print(hello.substring(3,7))//lo w
print(hello.substr(3,7))//lo worl
print(hello.toUpperCase())//HELLO WORLD !
var pattern=/.at/;
var matchers='cat,bat,sat,fat'.match(pattern)
print(matchers.index);//0
print(matchers[0]);//cat
print(matchers.lastIndex)
print('cat,bat,sat,fat'.search(/at/))// 1
print('cat,bat,sat,fat'.replace('at','ond'))//cond,bat,sat,fat
print('cat,bat,sat,fat'.replace(/at/g,'ond'))//cond,bond,sond,fond
print('cat,bat,sat,fat'.replace(/(.at)/g,'word$1'));//wordcat,wordbat,wordsat,wordfat
hello
120
red
------call---------
red
red
blue
red
blue
----bind------
blue
blue
主调函数：function outer() {
inner();
}
4
undefined
abc
------boolean-----
true
false
object
object
boolean
boolean
true
false
11111111
377
255
12.35
1.02340e+1
1.02e+1
------string-------
h
104
h
hello world !
lo world !
lo world !
lo world !
lo w
lo w
lo worl
HELLO WORLD !
0
cat
undefined
1
cond,bat,sat,fat
cond,bond,sond,fond
wordcat,wordbat,wordsat,wordfat
