限定輸入框輸入的為手機號

標簽：

Html5 JavaScript

<html>
<head>
</head>
<body>
<input type="text" id="ok">
<script>
document.getElementById("ok").onkeypress = function(e){
    var keycodes = new Array(0,48,49,50,51,52,53,54,55,56,57);
    var was = false;
    for(x in keycodes){
        if(keycodes[x] == e.charCode){
            was = true;
            break;
        }
        else{
            was = false;
        };
    };
    var val = this.value;
    if(was === true){
        switch(val.length){
            case 3:
                if(e.charCode !== 0){
                this.value += "-";
                }
                break;
            case 6:
                if(e.charCode !== 0){
                this.value += "-";
                }
                break;
            default:
                if(val.length > 10 && e.charCode !== 0){return false;};
                break;

        };
        val += e.charCode;
    }
    else{
        return false;
    };

};
</script>
</body>

只能输入纯数字和“-”，且首尾必须是数字