[英]Html5 Canvas Javascript making my webpage links unresponsive
我有一個html5畫布動畫。 當它運行時,會使我的頁面無響應,或者導航頁面的鏈接無響應。 沒有代碼直接這樣做。 我認為這是因為javascript會大大降低瀏覽器的速度。 無論如何,這是代碼的jsfiddle
http://jsfiddle.net/#&togetherjs=psm0e5RNeI
當我刪除包含主javascript文件(小提琴一個)時,鏈接可以正常工作。 如果我在代碼中注釋掉setInterval計時器,則網頁將保持無響應。 如果我注釋掉對draw函數下的cloud and light函數的調用,該函數是根據其他2個庫繪制元素的,則該網頁仍然沒有響應。
有人可以幫我弄清楚為什么會這樣嗎?
謝謝!
我還想補充一下,Web控制台中也沒有錯誤。
在這里,我還決定添加javascript:
var canvas = document.getElementById('canvas'),
context=canvas.getContext('2d');
var fullC = Math.PI * 2; // Ending circle angle
var cW = canvas.width; // canvas width
var cH = canvas.height; // canvas height
var sizeInc = 0;
var globCount = 0; // how many times start is called
// cloud vars //
var radius = 90; // radious for clouds
var clX = radius / 2;
var clY = radius / 2;
var centreX = context.canvas.width / 2;
var centreY = context.canvas.height / 2;
var colour = {r:255, g:255, b:254};
var alpha = 0.2;
var circles = 20; // number of circles in the cloud
// rain vars //
var rain = [];
var rainC = 55;
/// Rain objects ///
rain[0] = {
radius:2.5,
col:'red',
speed: getRandomInt(5,20),
ry:0,
rx:getRandomInt(0,canvas.width + 1000)
};
for(var i = 1; i <= rainC; i++){
rain[i] = {
radius:2.5,
col:'red',
speed: getRandomInt(5,20),
ry:0,
rx:getRandomInt(0,canvas.width + 1000)
};
}
/// Lightning ///
var lt = new lightning({glow: false});
var drawL = false;
/// Starts the Animation ///
function start(){
globCount ++;
clearIt();
setBack();
draw();
}
/// Draw calls all the components of the animation ///
function draw(){
clouds();
rainIt();
light();
}
/// Lightning Function ///
function light(){
var modResult = globCount % 50;
var modResult1 = globCount % 10;
if(modResult === 0){
drawL = true;
}
if(modResult1 === 0){
lt.hide();
}
if(drawL === true){
lt.hide();
lt.show(getRandomInt(100,canvas.width - 25),800, getRandomInt(100,canvas.width), canvas.height);
drawL = false;
}
}
/// Draws the clouds ///
function clouds(){
/// Draws a concentrated cluster and a sparse cluster ///
for(var i = 0; i <= 14; i++){
$cloudgen.drawCloud(context, clX + (i * radius) - 10, clY, radius + 20, colour, alpha, circles);
$cloudgen.drawCloud(context, clX + (i * radius) - 10, clY, radius, colour, 0.15, circles);
}
}
/// Rain function ///
function rainIt(){
/// Draws all the rain ///
rain.forEach(function(rain){
context.beginPath();
context.fillStyle = 'rgba(102,217,239,.5)';
context.arc(rain.rx,rain.ry,rain.radius,0,fullC);
context.closePath();
context.fill();
/// Resets rains x y points ///
if(rain.ry > canvas.height || rain.ry < 0){
rain.ry = 0;
rain.rx = getRandomInt(0,canvas.width);
}
if(rain.rx > canvas.width || rain.rx < 0){
rain.ry = 0;
rain.rx = getRandomInt(0,canvas.width);
}
rain.rx = rain.rx + getRandomInt(1,12);
rain.ry = rain.ry + rain.speed;
});
}
/// Sets the background ///
function setBack(){
context.fillStyle = 'rgba(61,131,227,0.5)';
context.fillRect(0,0,cW,cH);
}
/// Clears Canvas ///
function clearIt(){
context.clearRect(0,0,canvas.width,canvas.height);
}
/// Random number maker ///
function getRandomInt (min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
setInterval(start,100);
您使用一些簡化代碼,它創建了覆蓋所有其他元素的畫布。 因此,它會阻止鼠標輸入中的其他元素。 這是我在chrome調試工具中看到的內容:
<canvas width="1024px" height="888px" id="lightning_canvas" style="position: absolute; top: 0px; left: 0px;"></canvas>
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