Input box can only enter numbers, decimal point, minus sign

function checkValue(val){
    this.val=val;
} 
var discountValue=new checkValue("");// Define global variables, record the last legitimate values  
function clearNoNum(obj,isMinus,objValue)
{       
        var key = event.keyCode;
        var value = obj.value;
        // Defining legal press list, including a small keypad  0-9, The main keyboard area 0-9, decimal point  , The negative sign, bottom, left, and right arrow keys  ,home,end,delete
        var mayKey =new Array(8,35,36,37,38,39,40,46,48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105,110,190);
        if((key==189||key==109)&&isMinus&&objValue.val.length==0){// According to isMinus determine whether cannot enter a negative number  , If we can judge the negative sign is in the first  
                objValue.val = value;
                return false;
        }
        for(var i=0;i<mayKey.length;i++){
                if(key==mayKey[i]){
                        objValue.val = value;
                        return false;
                }
        }
        document.execCommand('undo');// If the keyboard is not click on the above button, clear the value of the input box  
        obj.value = objValue.val;// Set the global variable's value to the input box to last; a legal value assigned to an input box again  
}

function discountCheck(obj){
        clearNoNum(obj,false,discountValue);
}


Call page methods:
<input type="text" onkeyup="discountCheck(this)" />
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