当我加载html页面时，为什么我的外部JavaScript文件不能工作?
Why doesn't my external JavaScript file work when I load my html page?
我把html和JavaScript代码分开了。我将JavaScript代码放入一个单独的文件中，并使用"script"标签在我的html文件中引用它。在我的JavaScript代码中有两个函数，一个用于创建自动填充，这意味着如果我开始在文本框中输入文本，该函数会给我一个可能的名称，我可能想要在文本框下面写，另一个创建一个时钟，给出当前时间。这里是我的JavaScript和html文件分别。你能告诉我是什么问题吗?
function Complete(obj, evt) {
var names = new Array("albert","alessandro","chris");
names.sort();
if ((!obj) || (!evt) || (names.length == 0)) {
return;
}
if (obj.value.length == 0) {
return;
}
var elm = (obj.setSelectionRange) ? evt.which : evt.keyCode;
if ((elm < 32) || (elm >= 33 && elm <= 46) || (elm >= 112 && elm <= 123)) {
return;
}
var txt = obj.value.replace(/;/gi, ",");
elm = txt.split(",");
txt = elm.pop();
txt = txt.replace(/^'s*/, "");
if (txt.length == 0) {
return;
}
if (obj.createTextRange) {
var rng = document.selection.createRange();
if (rng.parentElement() == obj) {
elm = rng.text;
var ini = obj.value.lastIndexOf(elm);
}
} else if (obj.setSelectionRange) {
var ini = obj.selectionStart;
}
for (var i = 0; i < names.length; i++) {
elm = names[i].toString();
if (elm.toLowerCase().indexOf(txt.toLowerCase()) == 0) {
obj.value += elm.substring(txt.length, elm.length);
break;
}
}
if (obj.createTextRange) {
rng = obj.createTextRange();
rng.moveStart("character", ini);
rng.moveEnd("character", obj.value.length);
rng.select();
} else if (obj.setSelectionRange) {
obj.setSelectionRange(ini, obj.value.length);
}
}
function tick() {
var hours, minutes, seconds, ap;
var intHours, intMinutes, intSeconds;
var today;
today = new Date();
intHours = today.getHours();
intMinutes = today.getMinutes();
intSeconds = today.getSeconds();
switch(intHours){
case 0:
intHours = 12;
hours = intHours+":";
ap = "A.M.";
break;
case 12:
hours = intHours+":";
ap = "P.M.";
break;
case 24:
intHours = 12;
hours = intHours + ":";
ap = "A.M.";
break;
default:
if (intHours > 12) {
intHours = intHours - 12;
hours = intHours + ":";
ap = "P.M.";
break;
}
if(intHours < 12) {
hours = intHours + ":";
ap = "A.M.";
}
}
if (intMinutes < 10) {
minutes = "0"+intMinutes+":";
} else {
minutes = intMinutes+":";
}
if (intSeconds < 10) {
seconds = "0"+intSeconds+" ";
} else {
seconds = intSeconds+" ";
}
timeString = hours+minutes+seconds+ap;
Clock.innerHTML = timeString;
window.setTimeout("tick();", 100);
}
window.onload = tick;
<HTML>
<HEAD>
<H1 STYLE="text-align:center;" STYLE="font-family:verdana;">FDM Markets</H1>
<H2 STYLE="text-align:center;">Trading Platofrm</H2></br>
<STYLE type="text/css">
#p1 span {
width: 65px;
display: block;
float: left;
}
</STYLE>
<BODY>
<SCRIPT type="text/javascript" src="jscodeloginpage.js"></SCRIPT>
<p1>Login</p1></br>
</br>
<FORM name="anyForm">
Username: <input type="text" name="anyName" size="15" onKeyUp="Complete(this, event)"></br>
Password: <input type="text" size="15" name="password_box">
</FORM>
<div id=Clock style=font-size: 12"> </div>
</BODY>
</HTML>
好了，我把你的代码放到一个jsbin中。大多数问题是在代码调试器/错误控制台的帮助下发现的。
你有几个变量超出了作用域，这意味着:
if(x){
var a = 1;
}
if(y){
doSomethingWith(a);
/*
* JavaScript can't access `a` here, since it was declared in the scope of the
* previous `if`. That instance of `a` only exists within that first `if`.
*/
}
您在switch/case的default部分有一个错位的break，以及其他一些小问题。
请参阅我链接到的jsbin以获取工作示例。我也对你的HTML做了一些修改。这条线:
<div id=Clock style=font-size: 12"> </div>
缺少几个":
<div id="Clock" style="font-size: 12"> </div>
另外，</br>不是一个有效的标签，你可能正在寻找<br />
这是你编辑的JS:
function Complete(obj, evt) {
var names = new Array("albert","alessandro","chris");
names.sort();
var elm = (obj.setSelectionRange) ? evt.which : evt.keyCode;
if (!obj ||
!evt ||
names.length === 0 ||
obj.value.length === 0 ||
elm < 32 ||
(elm >= 33 && elm <= 46) ||
(elm >= 112 && elm <= 123)) {
return;
}
var txt = obj.value.replace(/;/gi, ",");
elm = txt.split(",");
txt = elm.pop();
txt = txt.replace(/^'s*/, "");
if (txt.length === 0) {
return;
}
var ini, rng;
if (obj.createTextRange) {
rng = document.selection.createRange();
if (rng.parentElement() == obj) {
elm = rng.text;
ini = obj.value.lastIndexOf(elm);
}
} else if (obj.setSelectionRange) {
ini = obj.selectionStart;
}
for (var i = 0; i < names.length; i++) {
elm = names[i].toString();
if (elm.toLowerCase().indexOf(txt.toLowerCase()) === 0) {
obj.value += elm.substring(txt.length, elm.length);
break;
}
}
if (obj.createTextRange) {
rng = obj.createTextRange();
rng.moveStart("character", ini);
rng.moveEnd("character", obj.value.length);
rng.select();
} else if (obj.setSelectionRange) {
obj.setSelectionRange(ini, obj.value.length);
}
}
function tick() {
var hours, minutes, seconds, ap;
var intHours, intMinutes, intSeconds;
var today;
today = new Date();
intHours = today.getHours();
intMinutes = today.getMinutes();
intSeconds = today.getSeconds();
switch(intHours){
case 0:
intHours = 12;
hours = intHours+":";
ap = "A.M.";
break;
case 12:
hours = intHours+":";
ap = "P.M.";
break;
case 24:
intHours = 12;
hours = intHours + ":";
ap = "A.M.";
break;
default:
if (intHours > 12) {
intHours = intHours - 12;
hours = intHours + ":";
ap = "P.M.";
}
if(intHours < 12) {
hours = intHours + ":";
ap = "A.M.";
}
break;
}
if (intMinutes < 10) {
minutes = "0"+intMinutes+":";
} else {
minutes = intMinutes+":";
}
if (intSeconds < 10) {
seconds = "0"+intSeconds+" ";
} else {
seconds = intSeconds+" ";
}
timeString = hours+minutes+seconds+ap;
Clock.innerHTML = timeString;
window.setTimeout(tick, 100);
}
window.onload = tick;
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