页面input限制

"text" name= "number" id = 'number' onkeyup="this.value=this.value.replace(/[^\d]/g,'')" />  

"text" name= "price" id = 'price' onkeyup="this.value=this.value.replace(/[^0-9/.]/g,'')"  />  

value=value.replace(/[^\w\.\/]/ig,'')

function checknum(obj)
    {   
      if(/^\d+\.?\d{0,1}$/.test(obj.value)){
         obj.value = obj.value;
      }else{
         obj.value = obj.value.substring(0,obj.value.length-1);
      }     
    }

var evt;
    if (document.createEvent) { 
      evt = document.createEvent("MouseEvents");
      evt.initMouseEvent("change", true, true, window, 0, 0, 0, 0, 0,false, false, false, false, 0, null);
      document.getElementById("textarea").dispatchEvent(evt);
    } else if (document.getElementById("textarea").fireEvent) { 
      document.getElementById("textarea").fireEvent('change');
    }