我正在尝试在keydown上调用javascript函数，但是我有一个错误：
/* Calling the javascript file */
$(document).ready(function() {
item_set();
});
/* custom.js */
function item_set(){
$(document).ready(function() {
function check(idname) {
// Allow: backspace, delete, tab, escape, enter and .
var e=document.getElementById(idname);
if (jQuery.inArray(e.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
// Allow: Ctrl+A, Command+A
(e.keyCode === 65 && (e.ctrlKey === true || e.metaKey === true)) ||
// Allow: home, end, left, right, down, up
(e.keyCode >= 35 && e.keyCode <= 40)) {
// let it happen, don't do anything
return;
}
// Ensure that it is a number and stop the keypress
if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
e.preventDefault();
}
};
};<input type="text" name="item_cost" id="item_cost" class="form-control" onkeydown="check(item_cost)" />控制台中的错误是：
ReferenceError：未定义检查
这有什么问题？
我认为您的问题是您需要在调用文件中引用自定义脚本。
<script src="custom.js"></script>
<script>
$(document).ready(function() {
item_set(); //now you have access to this function
});
</script>
旁注：我喜欢将所有脚本放在<body>的末尾，这样你就不必费心去用$(document).ready()
...
<body>
...
html
and
stuff
...
<script src="custom.js"></script>
<script>
item_set();
</script>
</body>