javascript 或 jquery : show multiple variables in one alert

Question

警报命令采用以下结构:

alert (variable)

如何在单个警报中显示多个变量？

Answer 1

Alert command assumes this structure: alert (variable)

不，alert() 采用这种结构:

    alert(some expression)

...where "some expression" is pretty much any JavaScript expression - if the expression is not a string it will be converted (though in some cases, e.g., for some objects the result might not be very meaningful).

So:

alert(variable);
alert("string literal");
alert(variable1 + variable2 + variable3);
alert(variable1 + ", " + variable2);
alert(resultOfFunctionCall());
alert([1,2,3]);
alert(whatever() + "else" + you.can.think + "of");

甚至:

alert();   // displays "undefined"

请注意，如果您尝试调试代码，最好使用 console.log()比 alert()。如果您尝试生成动态消息以向用户显示，只需根据需要连接变量，例如:

alert("Hello there " + name + ". Welcome.");