Question

以下代码无效，无法理解原因。我做错了什么？

     $(function() {
             var advanced = localStorage['advanced-search'];
             alert(advanced);//this shows true
             if((advanced == "true")|(advanced==true)){
                       //Code never reaches here
                      alert('click');
                    $('#advanced-search').trigger('click');
                    localStorage['advanced-search'] = false;
             }
});

Answer 1

检查OR运算符。它应该像 -

if((advanced == "true")||(advanced==true)){

Answer 2

此表达式不起作用：

if((advanced == "true")|(advanced==true)){

这就足够了：

if(advanced) {

因为"true"作为字符串也是“真实的”。

Answer 3

你错过了额外的|：

$(function() {
             var advanced = localStorage.getItem['advanced-search'];
             alert(advanced);//this shows true
             if((advanced == "true") || (advanced==true)){
                       //Code never reaches here
                      alert('click');
                    $('#advanced-search').trigger('click');
                    localStorage['advanced-search'] = false;
             }
});

Answer 4

OR运算符必须是两个| ..像这样：

if((advanced == "true") || (advanced==true)){

如果变量advanced是BOOLEAN，那么您只需使用它：

if(advanced) {
   // code here..
}

Answer 5

我认为你的javascript代码有误。所以你不能使用“|”而不是“||” 所以尝试通过以下代码解决您的错误。

      $(function() {
         var advanced = localStorage.getItem['advanced-search'];
         alert(advanced);//this shows true
         if((advanced == "true")||(advanced==true)){
                   //Code never reaches here
                  alert('click');
                $('#advanced-search').trigger('click');
                localStorage['advanced-search'] = false;
         }
    });

Answer 6

正如你所说，一个正确的OR运算符仍然无效，我怀疑它一定是问题。

检查这个小提琴： http://jsfiddle.net/VTfQU/

使用此代码简化if条件：

var advanced = localStorage.getItem['advanced-search'];
advanced = advanced.toString().toLowerCase();
if (advanced == "true") {
    $('#advanced-search').trigger('click');
    localStorage['advanced-search'] = "false";
}

我们的想法是将您的数据转换为小写，然后只检查该值的条件。我添加toString()只是为了安全，无论如何从本地存储中获取值总是一个字符串。

如果Windows上的条件加载不能在JavaScript中工作

6 个答案: