在Android浏览器中，不允许使用字母或除数字（0-9）或十进制之外的其他符号

IE 8

chrome

Safari

iphone

function dotplaced(myfield){
    if(myfield.indexOf(\".\")===-1){
        return false;
    }
    return true;    
}

function NumbersOnly(myfield, e) {
    var key;
    var keychar;

    if (window.event) {
        key = window.event.keyCode;
    }
    else if (e) {
        key = e.which;
    }
    else {
        return true;
    }

    keychar = String.fromCharCode(key);

    // control keys
    if ((key == null) || (key == 0) || (key == 8) ||
    (key == 9) || (key == 13) || (key == 27)) {
        return true;
    }
    // numbers
    else if (((\"0123456789\").indexOf(keychar) > -1)) {
        return true;
    }
    // decimal point jump
    else if (!dotplaced(myfield.value) && (keychar == \".\")) {
        //myfield.form.elements[dec].focus();        
        return true;
    }
    else {
        return false;
    }
}