摘要：轉(zhuǎn)換成小數(shù)模式，參數(shù)為小數(shù)點(diǎn)位數(shù)轉(zhuǎn)換成字符串，參數(shù)為進(jìn)制數(shù)返回對(duì)原型鏈中屬性返回以下屬性為屬性返回組成的數(shù)組凍結(jié)一個(gè)對(duì)象，使其不可被操作根據(jù)特定原型創(chuàng)建新對(duì)象使用實(shí)現(xiàn)的繼承返回結(jié)果數(shù)組或返回返回特定索引的字符返回特定字符的位置索引反向

Function.prototype.apply()

fun.apply(thisArg, [argsArray])

Function.prototype.call():
fun.call(thisArg[, arg1[, arg2[, ...]]])

Number.prototype.toFixed():
numObj.toFixed(digits) 轉(zhuǎn)換成小數(shù)模式，參數(shù)為小數(shù)點(diǎn)位數(shù)

Number.prototype.toString():
numObj.toString(radix) 轉(zhuǎn)換成字符串，參數(shù)為進(jìn)制數(shù)

Object.prototype.hasOwnProperty()
返回true or false,對(duì)原型鏈中屬性返回false

以下Object屬性為ESC5屬性
Object.keys()
返回kay組成的數(shù)組

Object.freeze()
凍結(jié)一個(gè)對(duì)象，使其不可被操作

Object.create()
Object.create(proto [, propertiesObject ])
根據(jù)特定原型創(chuàng)建新對(duì)象

使用Object.create實(shí)現(xiàn)的繼承

// Shape - superclass
function Shape() {
  this.x = 0;
  this.y = 0;
}

// superclass method
Shape.prototype.move = function(x, y) {
    this.x += x;
    this.y += y;
    console.info("Shape moved.");
};

// Rectangle - subclass
function Rectangle() {
  Shape.call(this); // call super constructor.
}

// subclass extends superclass
Rectangle.prototype = Object.create(Shape.prototype);
Rectangle.prototype.constructor = Rectangle;

var rect = new Rectangle();

rect instanceof Rectangle // true.
rect instanceof Shape // true.

rect.move(1, 1); // Outputs, "Shape moved."

RegExp.prototype.exec()
返回結(jié)果數(shù)組或null

RegExp.prototype.test()
返回true or false

String.prototype.charAt(index)
返回特定索引的字符

String.prototype.indexOf()
str.indexOf(searchValue[, fromIndex])
返回特定字符的位置索引

"Blue Whale".indexOf("Blue");     // returns  0
"Blue Whale".indexOf("Blute");    // returns -1
"Blue Whale".indexOf("Whale", 0); // returns  5
"Blue Whale".indexOf("Whale", 5); // returns  5
"Blue Whale".indexOf("", 9);      // returns  9
"Blue Whale".indexOf("", 10);     // returns 10
"Blue Whale".indexOf("", 11);     // returns 10

反向?yàn)?/em>String.prototype.lastIndexOf()

var digits = "0123456789"
var a = digits.split("",5)
//return ["0","1","2","3","4"]