Javascript，设置允许的字符函数

Question

当我将设置的“允许的字符函数”放入我的 javascript 文件中时，“窗口加载函数”不再起作用。谁能发现可能出了什么问题吗？

// --- ACTIVATES THE ON LOAD FUNCTION ---
    function init(){
        alert('ENTERED ON LOAD FUNCTION');
        myFunction_AlertThree();
    }

    window.onload = init; 

// ---> TESTING ONLY
    function myFunction_AlertThree() {
    alert('entered alert THREE function.');     
    }


//----------- SET ALLOWABLE CHARACTERS FUNCTION -----------     

    function inputLimiter(e,allow) {
        var AllowableCharacters = '';
        if (allow == 'Letters'{AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';}
        if (allow == 'Numbers'){AllowableCharacters='1234567890';}
        if (allow == 'NameCharacters'){AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz -.\'';}
        if (allow == 'NameCharactersAndNumbers'){AllowableCharacters='1234567890 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-.\'';}
        if (allow == 'Currency'){AllowableCharacters='1234567890.';}

    var k = document.all?parseInt(e.keyCode): parseInt(e.which);
        if (k!=13 && k!=8 && k!=0){
            if ((e.ctrlKey==false) && (e.altKey==false)) {
                return (AllowableCharacters.indexOf(String.fromCharCode(k))!=-1);
            } else {
                return true;
            }
        } else {
            return true;
        }
    } 

Answer 1

您缺少)

改变

if (allow == 'Letters'{AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';}
                     ^
                missing ) here

到

if (allow == 'Letters'){AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';}
                      ^
                 put it here

您应该使用浏览器控制台来处理这些错误，因为它会向您显示它们的位置和内容