javascript JScript 错误：无法分配给函数结果
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JScript error: Cannot assign to a function result
提问by Henry
In my application I am trying to hide a table based on a condition. I am using simple javascript function to hide the table.
在我的应用程序中，我试图根据条件隐藏表格。我正在使用简单的 javascript 函数来隐藏表格。
the function is failing on the following line
该功能在以下行失败
if ((image1.trim() = '') && (image2 != '1')) {
giving error
给出错误
'Microsoft JScript runtime error: Cannot assign to a function result'.
“Microsoft JScript 运行时错误：无法分配给函数结果”。
Here is the code.
这是代码。
Html code:
html代码：
<table id="tblImage" cellpadding="0" cellspacing="0" style="padding:2px 0px">
<tr>
<td>
<div id="otherImages"></div>
</td>
</tr>
</table>
Javascript function:
Javascript函数：
function DisplayTable() {
var image1 = document.getElementById('ctl00_ContentPlaceHolder1_image1').value;
var image2 = document.getElementById('ctl00_ContentPlaceHolder1_image2').value;
if ((image1.trim() = '') && (image2 != '')) {
jQuery('#tblImage').hide();
}
}
回答by Zbigniew
You are using =, but you should use ==:
您正在使用=，但您应该使用==：
if ((image1.trim() == '') && (image2 != '1')) {
Basicaly =means assign value and ==means is equal to. This generates error because it is not possible to assign value to function (which happens where, you're trying to assign value to trim()).
基本上=意味着赋值并且==意味着等于。这会产生错误，因为无法为函数赋值（这发生在您尝试为 赋值的地方trim()）。
回答by Jo?o Silva
You are using =(assignment) instead of ==(equals) in the folowing ifstatement, resulting in the assignment to a functionerror. Use the following instead:
您在以下语句中使用=( assignment) 而不是==( equals) if，从而导致assignment to a function错误。请改用以下内容：
if ((image1.trim() == '') && (image2 != '')) {
jQuery('#tblImage').hide();
}
回答by Shmiddty
if ((image1.trim() = '') && (image2 != '')) {
if ((image1.trim() = '') && (image2 != '')) {
should be
应该
if ((image1.trim() == '') && (image2 != '')) {
this__^
