首页 \ 问答 \ 使用JS闭包不将变量传递给onClick函数(Variable not being passed to onClick function using JS closures)

使用JS闭包不将变量传递给onClick函数(Variable not being passed to onClick function using JS closures)

 我阅读了解释Javascript范围和闭包 
 

 但我似乎无法使用以下代码。 正如您所看到的，我尝试了很多变化，并且无法将当前值传递给稍后将调用的函数。 
 

 当点击div时，我希望警报读取“START”而不是“END”...帮助？ 
 

 

 
 
 
  
var someString = "START";
document.getElementById('elem1').onclick = function(){
   return function(someString){
           alert(someString);
     }();
  };

document.getElementById('elem2').onclick = function(){
           alert(someString);
  };

document.getElementById('elem3').onclick = function(){
    alert(new String(someString));
};

document.getElementById('elem4').onclick = function(someString){
   return function(someString){
           alert(someString);
     }();
  };

document.getElementById('elem5').onclick = function(someString){
   return function(){
           alert(someString);
     }();
  };


document.getElementById('elem6').onclick = function(){
    var newSomeString =someString; 
    alert(newSomeString);
};


var someString = "END";
 
  
<body>
<div style="background-color='yellow';display:block;" id="elem1">1</div>
<br>
<div style="background-color='red';display:block;" id="elem2">2</div>
<br>
<div style="background-color='blue';display:block;" id="elem3">3</div>
<br>
<div style="background-color='green';display:block;" id="elem4">4</div>
<br>
<div style="background-color='orange';display:block;" id="elem5">5</div>
<br>
<div style="background-color='pink';display:block;" id="elem6">6</div>
<br>
</body>
 
 
 

 


I read through Explaining Javascript Scope and Closures
 

but I can't seem to get the following code to work. As you can see I have tried a lot of variations, and can't pass in the current value to a function that will be called later.
 

I want the alert to read "START" not "END" when the div is clicked... help?
 

 

 
 
 
  
var someString = "START";
document.getElementById('elem1').onclick = function(){
   return function(someString){
           alert(someString);
     }();
  };

document.getElementById('elem2').onclick = function(){
           alert(someString);
  };

document.getElementById('elem3').onclick = function(){
    alert(new String(someString));
};

document.getElementById('elem4').onclick = function(someString){
   return function(someString){
           alert(someString);
     }();
  };

document.getElementById('elem5').onclick = function(someString){
   return function(){
           alert(someString);
     }();
  };


document.getElementById('elem6').onclick = function(){
    var newSomeString =someString; 
    alert(newSomeString);
};


var someString = "END";
 
  
<body>
<div style="background-color='yellow';display:block;" id="elem1">1</div>
<br>
<div style="background-color='red';display:block;" id="elem2">2</div>
<br>
<div style="background-color='blue';display:block;" id="elem3">3</div>
<br>
<div style="background-color='green';display:block;" id="elem4">4</div>
<br>
<div style="background-color='orange';display:block;" id="elem5">5</div>
<br>
<div style="background-color='pink';display:block;" id="elem6">6</div>
<br>
</body>
 
 
 

 


原文：https://stackoverflow.com/questions/28443313
更新时间：2022-12-18 16:12

最满意答案

 ERROR 0表示MySQL向导无法安装，启动或配置新服务器。 通常删除已安装的实例并将其重置将有助于解决此问题。 
 

 尝试 
 

 1. explorer中的ONEN mysql 
 

 2运行mysql_uninstallservice 
 

 3.运行mysql_installservice 

Thank you for everyone's help. It seems that I have solved the problem now, although I am not sure what the bug was. I have taken several actions:
 

     
 
  • reset password for mysql user
    •  
 
  • Used mysqli* method
    •  
 
  • used try-catch method in the php script.
    •

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