Question

<script>
    var name, address, city, state, zip, birthdate , social, response1, info; 

    //Function call - vitalinfo prompts user 7 times
    function vitalinfo() {

name = window.prompt("Please enter your name", "Example: Jane Doe");

address = window.prompt("Please enter your address", "Example: 123 Main St");

city = window.prompt("Please enter your city","Example: Punxsutawney");

state = window.prompt("Please enter your state", "Example: Pennsylvania");

zip = window.prompt("Please enter your zip","Example: 12345");

birthdate = window.prompt("Please enter your birthdate","12-29-1987");

social = window.prompt("Please enter your social security number","123-45-6789"); 

//end prompts

vitalinfo= window.confirm("Do you want to review the information you entered?");

if (vitalinfo == true)
 {
window.alert (
        "Your name is " + name + "\n" + 

        "Your address is " + address + "\n" +

        "Your city is " + city + "\n" +

        "Your state is " + state + "\n" +

        "Your zip is " + state + "\n" +

        "Your birth date is " + birthdate + "\n" +

        "Your social security number is " + social);
}

}

我想在我的js中有条件，这样如果name，address，zip等变量返回null，它就是空白或完全从警报中排除。我不知道从哪里开始。

Answer 1

您可以先使用if语句构建字符串，然后提醒它，或使用ternary operator作为内联函数：{/ p>

window.alert (
    (name ? "Your name is " + name + "\n" : '') + 
    (address ? "Your address is " + address + "\n" : '') // + etc.
);

这将有效，除非您希望显示值，即使它们是''，undefined，null，false，0或{{ 1}}。

Javascript条件到警报

1 个答案: