语法错误：丢失； 在javascript循环中串联时的before语句

Question

I used contact in php like this

$location_space     = '';
$location_formation = '';

foreach($location as $formation) {
    $location_formation .= $formation.', ';
    $location_space     .= $formation.'<br />';
}

When I wanted to change it into javascript:

var location_space      = '';
var location_formation  = '';

for (i = 0; i < new_location.length; i++) {
    var location_space      += new_location[i] + ', ';
    var location_formation  += new_location[i] + '<br />';
}

It showed me this error

Error: SyntaxError: missing ; before statement
Line: 311, Column: 32
Source Code: var location_space += new_location[i] + ', ';

So what is wrong?

Answer 1

You have already defined location_space and location_formation , so you only need to assign a value to them, not redeclare them inside the for() loop:

var location_space      = '';
var location_formation  = '';

for (var i = 0; i < new_location.length; i++) 
{
    location_space      += new_location[i] + ', ';
    location_formation  += new_location[i] + '<br />';
}

Answer 2

您已经在for循环之前声明了变量，因此，如果从循环内部删除var ，则字符串连接应该起作用。

Answer 3

You should not define the location_space and location_formation in the for again.
Change your code to this:

 var location_space      = '';
 var location_formation  = '';
 for(var i = 0; i < new_location.length; i++)
 {
     location_space      += new_location[i] + ', ';
     location_formation  += new_location[i] + '<br />';
 }

Answer 4

Change it to :

for (i = 0; i < new_location.length; i++) {
    location_space      += new_location[i] + ', ';
    location_formation  += new_location[i] + '<br />';
}

and try

Answer 5

Try to replace with:

var location_space      = '';
var location_formation  = '';

for(i=0; i<new_location.length; i++) {
    location_space      += new_location[i] + ', ';
    location_formation  += new_location[i] + '<br />';
}

You're trying to declare location_space and location_formation again and use it like it was declared before "+=".