長手,如果在JavaScript看起來: function somefunction(param){
if(typeof(param) != 'undefined'){
var somevar = param;
} else {
alert('ERROR: missing parameter in somefunction. Check you
我在一次採訪中遇到了這個問題,無法提出解決方案。我知道反之亦然可以如下所示完成What does the "+=" operator do in Java? 所以問題如下。 ..... x = .....;
..... y = .....;
x += y; //compile error
x = x + y; //works properly
有些人喜歡用簡單的文本方式描述他們的數據庫結構,而不是使用CREATE TABLE語句。有幾個例子: Foreign key as Primary key Multiple Primary Keys as single foreign key How can I set up a database schema where there are two concurrent many-many re