name属性
实现
String get name {
var errorName = JS('String', '#.name', this);
// Although Safari nightly has updated the name to SecurityError, Safari 5
// and 6 still return SECURITY_ERR.
if (Device.isWebKit && errorName == 'SECURITY_ERR') return 'SecurityError';
// Chrome release still uses old string, remove this line when Chrome stable
// also prints out SyntaxError.
if (Device.isWebKit && errorName == 'SYNTAX_ERR') return 'SyntaxError';
return errorName as String;
}