js 常見問題 2

(1)數值相加時結尾自動多出“0”

 解決方法：

var totalpricestr=string(totalprice);  

/                if(totalpricestr)  

               var find = "\\.";//對句點要轉義  

               var reg = new regexp(find, "g");  

               var c = totalpricestr.match(reg);  

                   if(c){  

                       if(com.whuang.hsj.endwith(totalpricestr,'00004')){  

                           alert("111");  

                           totalpricestr=totalpricestr.replace(/[0]+0004$/,"");  

                       }  

                    }  

                newtd03.innerhtml ="總計："+totalpricestr+"元";  

 說明：totalprice是number類型，值為：44.230000000000004

(2)判斷字元串是否包含句點

var find = "\\.";//對句點要轉義  

                   alert("has .")  

                    }else{  

                       alert("no . !!!") ;  

(3)如何清空數組

var shoppingcart=new array();//儲存購物車内容  

 shoppingcart.splice(0,shoppingcart.length);    

var shoppingcartdiv=$('#shoppingcartdiv');  

hoppingcartdiv.empty();