页面input限制

1. input限制只能是整数

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

    

2. input限制只能是小数

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

    

3. input限制不能输入中文

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

    

4. 保留一位小数

   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);
         }     
       }

    

5. 模拟change事件

   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');
       }