很久以前,如果(在此站点上)发现一些代码阻止用户在文本框中输入字母,并且它起作用了。自从找到此代码后,我对其进行了更改并添加,但现在它不起作用。这是我的代码:
var count = 1
function isNumberKey(event) {
var keyCode = window.event ? event.keyCode : event.which;
if (event.keyCode === 8 // backspace
|| event.keyCode === 46 // delete
|| event.keyCode === 13 // enter key
|| event.keyCode === 9 // tab
|| event.keyCode === 116 // F5 (refresh)
|| event.keyCode === 112 // F1
|| event.keyCode === 113 //F2
|| event.keyCode === 114 //F3
|| event.keyCode === 115 //F4
|| event.keyCode === 117 //F6
|| event.keyCode === 118 //F7
|| event.keyCode === 119 //F8
|| event.keyCode === 120 //F9
|| event.keyCode === 121 //F10
|| event.keyCode === 122 //F11
|| event.keyCode === 123 //F12
) {
return true;
}
else if ( key < 48 || key > 57) {
if (count < 6) {
count++; //adds one to count
}
else {
alert("Please Only Enter Numerical Values");
count = 1;
}
return false;
}
else return true;
}
我并不是声称我制作/编写了这段代码,但任何人都可以看到该代码有任何问题吗?
最佳答案
这会起作用。它不起作用,因为您使用 key < 48 || key > 57
相反 event.keyCode < 48 || event.keyCode > 57
var count = 1
function isNumberKey(event) {
var keyCode = window.event ? event.keyCode : event.which;
if (event.keyCode === 8 // backspace
|| event.keyCode === 46 // delete
|| event.keyCode === 13 // enter key
|| event.keyCode === 9 // tab
|| event.keyCode === 116 // F5 (refresh)
|| event.keyCode === 112 // F1
|| event.keyCode === 113 //F2
|| event.keyCode === 114 //F3
|| event.keyCode === 115 //F4
|| event.keyCode === 117 //F6
|| event.keyCode === 118 //F7
|| event.keyCode === 119 //F8
|| event.keyCode === 120 //F9
|| event.keyCode === 121 //F10
|| event.keyCode === 122 //F11
|| event.keyCode === 123 //F12
) {
return true;
}
else if ( event.keyCode < 48 || event.keyCode > 57) {
if (count < 6) {
count++; //adds one to count
}
else {
alert("Please Only Enter Numerical Values");
count = 1;
}
return false;
}
else return true;
}
关于javascript - isNumberKey() 不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29742288/