两个无法理解的 JS 错误
2007-10-09 03:16 晓风残月 阅读(1262) 评论(1) 编辑 收藏 举报
两个无法理解的JS错误，以及解决方案：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script type ="text/javascript">
var a;
var $1 = document.getElementById;
var $2 = function(id) { return document.getElementById(id); }
function foo() {
//
alert(a);
alert(!a);
//alert(b); // ERROR 'b' 未定义
alert(window.b); // OK
//alert(!b); // ERROR 'b' 未定义
alert(!window.b); // OK
//
// OK: IE,
// ERROR: FireFox 错误： uncaught exception: [Exception
"Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" location: "JS frame :: http://localhost/Digdotnet.Test/JSSample/Dig_$_undefined.htm :: foo :: line 18" data: no]
// Opera Unhandled exception: [Object InternalException] message: WRONG_THIS_ERR
//var o1 = $1("none");
//alert(o1);
var o2 = $2("none"); // OK
alert(o2);
}
window.onload = function() { foo(); }
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title>Untitled Page</title> <script type ="text/javascript">
var a; var $1 = document.getElementById; var $2 = function(id) { return document.getElementById(id); }
function foo() { // alert(a); alert(!a); //alert(b); // ERROR 'b' 未定义 alert(window.b); // OK //alert(!b); // ERROR 'b' 未定义 alert(!window.b); // OK // // OK: IE, // ERROR: FireFox 错误： uncaught exception: [Exception "Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" location: "JS frame :: http://localhost/Digdotnet.Test/JSSample/Dig_$_undefined.htm :: foo :: line 18" data: no] // Opera Unhandled exception: [Object InternalException] message: WRONG_THIS_ERR //var o1 = $1("none"); //alert(o1); var o2 = $2("none"); // OK alert(o2); } window.onload = function() { foo(); } </script></head><body></body></html>
