Web前端银行卡号分段输入效果(如：6225 7687 0971 2222)

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// 输入银行卡号时的分段处理效果(如：6225 7687 0971 2222)function convertSpace(obj){    var val = $.trim(obj.value).replace(/\s/g, '');    var val2 = "";    var len = 0;    for (var i = 0; i < val.length; i++) {        var ch = val.charAt(i);        if(ch >= 0 && ch <= 9) {            val2 += ch;            ++len;            if (len % 4 == 0) {                val2 += ' ';            }        }    }        if(val2.substring(val2.length-1,val2.length)== ' ')    {        val2 = val2.substring(0,val2.length-1)    }        if(obj.value != val2) {        var pos = getPositionForInput(obj);        obj.value = val2;        if(pos != val2.length) {            if(val2.charAt(pos - 1) == ' ') {                pos++;            }            setPositionForInput(obj, pos);        }    }}