Javascript 未捕获的 ReferenceError：赋值中的左侧无效
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Uncaught ReferenceError: Invalid left-hand side in assignment
提问by sebastian rus
<script>
function urlencode(str) {
return escape(str).replace('+', '%2B').replace('%20', '+').replace('*', '%2A').replace('/', '%2F').replace('@', '%40');
}
$('input#q').keyup(function(e) {
if(e.keyCode == 13) {
if($('input#q').val().length > 2)
{
$('input#q').val() = urlencode($('input#q').val());
document.search_form.submit();
}
}
});
$('input#search').click(function() {
if($('input#q').val().length > 2)
{
$('input#q').val() = urlencode($('input#q').val());
document.search_form.submit();
}
});
</script>
when i click the search button i get the following error : "Uncaught ReferenceError: Invalid left-hand side in assignment" But the code is actually the same as when i press "enter". Can someone explain?
当我单击搜索按钮时，我收到以下错误：“未捕获的 ReferenceError：分配中的左侧无效”但代码实际上与我按“输入”时相同。有人可以解释一下吗？
回答by Alex Gyoshev
You can't assign a new value to the result of a function
您不能为函数的结果分配新值
$('input#q').val() = urlencode($('input#q').val());
Use this instead:
改用这个：
$('input#q').val(urlencode($('input#q').val()))
It wouldn't work with the keypress either - maybe the page is simply submitted after the same js error occurs.
它也不适用于按键 - 也许页面只是在发生相同的 js 错误后提交。
回答by coder
Why are you assinging a result of a function like this:
为什么要对这样的函数进行结果赋值：
$("input#q").val = urlencode($('input#q').val())
Use this instead
改用这个
$("input").val(urlencode($('input#q').val())
