为什么第37行只要我写return flase;页面就没有输出，但函数功能正常？

index.html

<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb18030">
    <title>Untitled Document</title>
    
</head>
<body>
    <script type="text/javascript">   
        /*
         * param1 Array 
         * param2 Array
         * return true or false
         */
        function arraysSimilar(arr1, arr2){
            var len1 = arr1.length;
            var len2 = arr2.length;
            if(len1 == len2 && arr1 instanceof Array && arr2 instanceof Array){
                var types1 = [];
                var types2 = [];
                for(var i = 0; i < len1; i++){
                    var a1 = confirmType(arr1[i]);
                    if(types1.join().indexOf(a1) == -1){
                        types1.push(a1);
                    }
                    var a2 = confirmType(arr2[i]);
                    if(types2.join().indexOf(a2) == -1){
                        types2.push(a2);
                    }
                }
                var sTypes1 = types1.sort().join();
                var sTypes2 = types2.sort().join();
                if(sTypes1 == sTypes2){
                    return true;
                }
                else{
                    return false;
                }
            }
            else{
                return false;
            }
        }
        
        function confirmType(obj){
            var n = typeof(obj);
            if(n == "object"){
                if(obj instanceof Array){
                    return "array";
                }
                else if(obj instanceof Date){
                    return "date";
                }
                else if(obj instanceof Function){
                    return "function";
                }
                else if(obj instanceof Window){
                    return "window";
                }
                else if(obj === null){
                    return "null";
                }
            }
            else{
                return n;
            }
        }
    </script>
    <script src="testData.js"></script>
</body>
</html>

testData.js

var result=function(){
    //以下为多组测试数据
            var cases=[{
                    arr1:[1,true,null],
                    arr2:[null,false,100],
                    expect:true
                },{
                    arr1:["444",100],
                    arr2:[100,22],
                    expect:false
                },{
                    arr1:[null,999],
                    arr2:[{},444],
                    expect:false
                },{
                    arr1:[window,1,true,new Date(),"hahaha",(function(){}),undefined],
                    arr2:[undefined,(function(){}),"okokok",new Date(),false,2,window],
                    expect:true
                },{
                    arr1:[new Date()],
                    arr2:[{}],
                    expect:false
                },{
                    arr1:[window],
                    arr2:[{}],
                    expect:false
                },{
                    arr1:[undefined,1],
                    arr2:[null,2],
                    expect:false
                },{
                    arr1:[new Object,new Object,new Object],
                    arr2:[{},{},null],
                    expect:false
                },{
                    arr1:null,
                    arr2:null,
                    expect:false
                },{
                    arr1:[],
                    arr2:undefined,
                    expect:false
                },{
                    arr1:"abc",
                    arr2:"cba",
                    expect:false
                }];
                
            
    //使用for循环, 通过arraysSimilar函数验证以上数据是否相似，如相似显示“通过”,否则"不通过",所以大家要完成arraysSimilar函数,具体要求，详见任务要求。    
            for(var i=0;i<cases.length;i++){
                if(arraysSimilar(cases[i].arr1,cases[i].arr2)!==cases[i].expect) {
                    document.write("不通过！case"+(i+1)+"不正确！arr1="+JSON.stringify(cases[i].arr1)+", arr2="+JSON.stringify(cases[i].arr2)+" 的判断结果不是"+cases[i].expect);
                    return false;
                }                
            }
            return true;
            
        }();
    document.write("判定结果:"+(result?"通过":"不通过"));

index.html是我的提交，请大家帮忙看看

Tropicloz

浏览 1133回答 1

1回答

elpsycongroo

有组数据为null，导致无法获取arr1、arr2长度，报错。针对arr1、arr2值为null的情况进行判断处理。和37行没有关系

2 0

随时随地看视频慕课网APP