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javascript指針,關(guān)于指針的代碼

javascript 如何得到鼠標(biāo)指針下面 元素

script language="javascript"

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document.onmousemove = function(){

document.getElementById("out").innerText = event.srcElement.id

}

/script

div id="out"/div

div id="aa"aa/div

div id="bb"bb/div

javascript this[i]

一般來(lái)說(shuō),this指針指向當(dāng)前函數(shù)的所有者。

在這個(gè)例子中,this指向構(gòu)造函數(shù)Marray(也可以成為類);

this[i]相當(dāng)于Marray的一個(gè)屬性或者方法!

javascript函數(shù)的this指針代表的對(duì)象

你要知道兩點(diǎn):1 、javascript里面所有元素都是對(duì)象,當(dāng)然包括函數(shù)也是;2、在Javascript里面,this指針代表的是執(zhí)行當(dāng)前代碼的對(duì)象的所有者。 根據(jù)兩個(gè)原則可以很容易判斷,比如第一個(gè),這個(gè)this的所有者是window 所以這個(gè)this.x=0;你可以理解成為window.x=0; 其他的你自己判斷吧

JavaScript中函數(shù)里關(guān)于指針調(diào)用的用法?

函數(shù)調(diào)用

function test(){

alert(1);

}

直接調(diào)用

test();

指定內(nèi)部this指針調(diào)用

(1)test.call(window);//執(zhí)行test函數(shù),將方法內(nèi)部this指向window

(2)test.apply(window);///執(zhí)行test函數(shù),將方法內(nèi)部this指向window

通過(guò)事件調(diào)用

window.onload = test;//當(dāng)頁(yè)面載入時(shí)調(diào)用

window.onerror = test;當(dāng)頁(yè)面發(fā)生錯(cuò)誤時(shí)調(diào)用

javascript特效問(wèn)題 頁(yè)面上有許多點(diǎn)一直跟隨著鼠標(biāo)指針的移動(dòng)。如何實(shí)現(xiàn)這個(gè)這個(gè)效果.

新建html復(fù)制黏貼運(yùn)行即可

html

head

title鼠標(biāo)跟隨效果/title

style type="text/css"

html {

overflow: hidden;

}

body {

position: absolute;

height: 100%;

width: 100%;

margin:0;

padding:0;

}

#screen {

background:#000;

position: absolute;

width: 100%;

height: 100%;

}

#screen span {

background: #fff;

font-size: 0;

overflow: hidden;

width: 2px;

height: 2px;

}

/style

script type="text/javascript"

var Follow = function () {

var $ = function (i) {return document.getElementById(i)},

addEvent = function (o, e, f) {o.addEventListener ? o.addEventListener(e, f, false) : o.attachEvent('on'+e, function(){f.call(o)})},

OBJ = [], sp, rs, N = 0, m;

var init = function (id, config) {

this.config = config || {};

this.obj = $(id);

sp = this.config.speed || 4;

rs = this.config.animR || 1;

m = {x: $(id).offsetWidth * .5, y: $(id).offsetHeight * .5};

this.setXY();

this.start();

}

init.prototype = {

setXY : function () {

var _this = this;

addEvent(this.obj, 'mousemove', function (e) {

e = e || window.event;

m.x = e.clientX;

m.y = e.clientY;

})

},

start : function () {

var k = 180 / Math.PI, OO, o, _this = this, fn = this.config.fn;

OBJ[N++] = OO = new CObj(null, 0, 0);

for(var i=0;i360;i+=20){

var O = OO;

for(var j=10; j35; j+=1){

var x = fn(i, j).x,

y = fn(i, j).y;

OBJ[N++] = o = new CObj(O , x, y);

O = o;

}

}

setInterval(function() {

for (var i = 0; i N; i++) OBJ[i].run();

}, 16);

}

}

var CObj = function (p, cx, cy) {

var obj = document.createElement("span");

this.css = obj.style;

this.css.position = "absolute";

this.css.left = "-1000px";

this.css.zIndex = 1000 - N;

document.getElementById("screen").appendChild(obj);

this.ddx = 0;

this.ddy = 0;

this.PX = 0;

this.PY = 0;

this.x = 0;

this.y = 0;

this.x0 = 0;

this.y0 = 0;

this.cx = cx;

this.cy = cy;

this.parent = p;

}

CObj.prototype.run = function () {

if (!this.parent) {

this.x0 = m.x;

this.y0 = m.y;

} else {

this.x0 = this.parent.x;

this.y0 = this.parent.y;

}

this.x = this.PX += (this.ddx += ((this.x0 - this.PX - this.ddx) + this.cx) / rs) / sp;

this.y = this.PY += (this.ddy += ((this.y0 - this.PY - this.ddy) + this.cy) / rs) / sp;

this.css.left = Math.round(this.x) + 'px';

this.css.top = Math.round(this.y) + 'px';

}

return init;

}();

/script/head

body

div id="screen"/div

script type="text/javascript"

new Follow('screen', {speed: 4,

animR : 2,

fn : function (i, j) {

return {

x : j/4*Math.cos(i),

y : j/4*Math.sin(i)

}

}})

/script/body

/html

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