当涉及到dwr时，它启动失败，并在engine.js中出错；我认为dwr需要做一些改进。因为大部分时间错误是未知的。所以在上面的例子中——我们在dwr的ajax调用中使用selectobj1（像数组一样）和selectobj2（像数组一样）传递一些数据，数据的构造方式多年来没有改变；然后我们注意到在selectobj1中传递了一个带有逗号的十进制值，在将数据提供给dwr的ajax调用和bingo之前，我们去掉了逗号！成功了。代码修复如下；

//we are omitting the construction of other object being passed in i.e. selectObj2
var indexBrkLp = 0;
if (priceVal != null){
    while (priceVal.includes(",")){
        indexBrkLp++;
        priceVal = priceVal.replace(",", "")
        if (indexBrkLp > 5){
            break;
        }
    }
}

var selectObj1={
    val2:(val2 == null? "": val2),
    priceVal :(priceVal == null? "": priceVal)
};

if (document.getElementById("someCheckBox").checked) {
    //Below controllerClass is the name of JS class produced by DWR but actually it's a Java class (i.e. object used below)
    controllerClass.someMethod("Value1", selectObj1, selectObj2, 'Value2', 'Value1', function(data) {
    if (data != null) {
         hideView("viewOne",false);     //user defined function call
         fillData("viewName",data[0]);  //user defined function to fill the returned data
         valueRet1 = data[1]; 
         someConst = "X";
         displayNavCon(pageNumber); //user defined function to control the navigation on web page
      }  else {
        alert("No Data Found!!!");  
        recordCount=0;
    }
});

结论-如果您看到engine.js失败了，那么它可能不仅仅是代码中的错误；它可能是它不喜欢的数据，也可能是与dwr相关的其他配置。