我正在尝试使按钮正常工作，但它们不调用“ onmouse”并返回null
这些按钮是：
<button type="button" id='right' class='right' name="button">
<button type="button" id='left' class='left' name="button">
Javascript：
var curpage = 1;
var sliding = false;
var click = true;
var left = document.getElementById("left");
var right = document.getElementById("right");
var pagePrefix = "slide";
var pageShift = 500;
var transitionPrefix = "circle";
var svg = true;
document.onkeydown = checkKey;
function leftSlide() {
if (click) {
if (curpage == 1) curpage = 5;
console.log("woek");
sliding = true;
curpage--;
svg = true;
click = false;
for (k = 1; k <= 4; k++) {
var a1 = document.getElementById(pagePrefix + k);
a1.className += " tran";
}
setTimeout(() => {
move();
}, 200);
setTimeout(() => {
for (k = 1; k <= 4; k++) {
var a1 = document.getElementById(pagePrefix + k);
a1.classList.remove("tran");
}
}, 1400);
}
}
function rightSlide() {
if (click) {
if (curpage == 4) curpage = 0;
console.log("woek");
sliding = true;
curpage++;
svg = false;
click = false;
for (k = 1; k <= 4; k++) {
var a1 = document.getElementById(pagePrefix + k);
a1.className += " tran";
}
setTimeout(() => {
move();
}, 200);
setTimeout(() => {
for (k = 1; k <= 4; k++) {
var a1 = document.getElementById(pagePrefix + k);
a1.classList.remove("tran");
}
}, 1400);
}
}
function move() {
if (sliding) {
sliding = false;
if (svg) {
for (j = 1; j <= 9; j++) {
var c = document.getElementById(transitionPrefix + j);
c.classList.remove("steap");
c.setAttribute("class", transitionPrefix + j + " streak");
console.log("streak");
}
} else {
for (j = 10; j <= 18; j++) {
var c = document.getElementById(transitionPrefix + j);
c.classList.remove("steap");
c.setAttribute("class", transitionPrefix + j + " streak");
console.log("streak");
}
}
// for(k=1;k<=4;k++){
// var a1 = document.getElementById(pagePrefix + k);
// a1.className += ' tran';
// }
setTimeout(() => {
for (i = 1; i <= 4; i++) {
if (i == curpage) {
var a = document.getElementById(pagePrefix + i);
a.className += " up1";
} else {
var b = document.getElementById(pagePrefix + i);
b.classList.remove("up1");
}
}
sliding = true;
}, 600);
setTimeout(() => {
click = true;
}, 1700);
setTimeout(() => {
if (svg) {
for (j = 1; j <= 9; j++) {
var c = document.getElementById(transitionPrefix + j);
c.classList.remove("streak");
c.setAttribute("class", transitionPrefix + j + " steap");
}
} else {
for (j = 10; j <= 18; j++) {
var c = document.getElementById(transitionPrefix + j);
c.classList.remove("streak");
c.setAttribute("class", transitionPrefix + j + " steap");
}
sliding = true;
}
}, 850);
setTimeout(() => {
click = true;
}, 1700);
}
}
// null here
left.onmousedown = () => {
leftSlide();
};
right.onmousedown = () => {
rightSlide();
};
function checkKey(e) {
e = e || window.event;
if (e.keyCode == 37) {
leftSlide();
} else if (e.keyCode == 39) {
rightSlide();
}
};
HTML：
<!-- Slide comienzo -->
<body>
<div class='parent'>
<div class='slider'>
<button type="button" id='right' class='right' name="button">
<svg version="1.1" id="Capa_1" width='40px' height='40px ' xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 477.175 477.175" style="enable-background:new 0 0 477.175 477.175;" xml:space="preserve">
<g>
<path style='fill: #9d9d9d;' d="M360.731,229.075l-225.1-225.1c-5.3-5.3-13.8-5.3-19.1,0s-5.3,13.8,0,19.1l215.5,215.5l-215.5,215.5
c-5.3,5.3-5.3,13.8,0,19.1c2.6,2.6,6.1,4,9.5,4c3.4,0,6.9-1.3,9.5-4l225.1-225.1C365.931,242.875,365.931,234.275,360.731,229.075z
"/>
</g>
</svg>
</button>
<button type="button" id='left' class='left' name="button">
<svg version="1.1" id="Capa_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 477.175 477.175" style="enable-background:new 0 0 477.175 477.175;" xml:space="preserve">
<g>
<path style='fill: #9d9d9d;' d="M145.188,238.575l215.5-215.5c5.3-5.3,5.3-13.8,0-19.1s-13.8-5.3-19.1,0l-225.1,225.1c-5.3,5.3-5.3,13.8,0,19.1l225.1,225
c2.6,2.6,6.1,4,9.5,4s6.9-1.3,9.5-4c5.3-5.3,5.3-13.8,0-19.1L145.188,238.575z"/>
</g>
</svg>
</button>
<svg id='svg2' class='up2' xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<circle id='circle1' class='circle1 steap' cx="34px" cy="49%" r="20" />
<circle id='circle2' class='circle2 steap' cx="34px" cy="49%" r="100" />
<circle id='circle3' class='circle3 steap' cx="34px" cy="49%" r="180" />
<circle id='circle4' class='circle4 steap' cx="34px" cy="49%" r="260" />
<circle id='circle5' class='circle5 steap' cx="34px" cy="49%" r="340" />
<circle id='circle6' class='circle6 steap' cx="34px" cy="49%" r="420" />
<circle id='circle7' class='circle7 steap' cx="34px" cy="49%" r="500" />
<circle id='circle8' class='circle8 steap' cx="34px" cy="49%" r="580" />
<circle id='circle9' class='circle9 steap' cx="34px" cy="49%" r="660" />
</svg>
<svg id='svg1' class='up2' xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<circle id='circle10' class='circle10 steap' cx="648px" cy="49%" r="20" />
<circle id='circle11' class='circle11 steap' cx="648px" cy="49%" r="100" />
<circle id='circle12' class='circle12 steap' cx="648px" cy="49%" r="180" />
<circle id='circle13' class='circle13 steap' cx="648px" cy="49%" r="260" />
<circle id='circle14' class='circle14 steap' cx="648px" cy="49%" r="340" />
<circle id='circle15' class='circle15 steap' cx="648px" cy="49%" r="420" />
<circle id='circle16' class='circle16 steap' cx="648px" cy="49%" r="500" />
<circle id='circle17' class='circle17 steap' cx="648px" cy="49%" r="580" />
<circle id='circle18' class='circle18 steap' cx="648px" cy="49%" r="660" />
</svg>
<div id='slide1' class='slide1 up1'>Drake</div>
<div id='slide2' class='slide2'>BEACH</div>
<div id='slide3' class='slide3'>FOREST</div>
<div id='slide4' class='slide4'>DESERT</div>
</div>
</div>
</body>
<!-- slide fin -->
我希望我的按钮以其各自的ID调用各自的函数，但似乎由于某种原因没有到达。浏览器给我这个错误：
未捕获的TypeError：无法将属性'onmousedown'设置为null 在文件：/// C：/ Users / Diego / Desktop / New％20Portfolio％20（1）/New%20Portfolio/src/js/script.js:128:19 （匿名）@ script.js：128
答案 0 :(得分：0)
在何处添加？。您可以通过Codepen共享代码吗？也许您在HTML部件渲染之前调用了脚本