联系人保存结果未在Javascript中显示

我用JavaScript编写了一个电话号码保护程序。一切正常，但在搜索框中搜索姓名或号码时，不会显示任何结果：

function contact() {
    var nam1=prompt("Please enter the name");
    var num1=prompt("please enter the phone number");
}

contact();

function search() {
    var searc= prompt("Please enter the name of your contact or phone number");
}

search();

//search box

if ( searc == nam1 ) {
    alert("The phone Number is , " + num1);
}

if ( searc == num1 ) {
    alert("The Contact Name is , " + nam1);
}

试试这个：

var nam1='';
var num1='';
var searc='';

function contact() {
    nam1=prompt("Please enter the name");
    num1=prompt("please enter the phone number");
}
contact();
function search() {
    searc= prompt("Please enter the name of your contact or phone number");
}
search();
//search box
if ( searc == nam1 ) {
    alert("The phone Number is , " + num1);
}
if ( searc == num1 ) {
    alert("The Contact Name is , " + nam1);
}

var nam1;
var num1;
var searc;

function contact() {

    nam1 = prompt("Please enter the name");
    num1 = prompt("please enter the phone number");

}

contact();

function search() {

    searc = prompt("Please enter the name of your contact or phone number");

}

search();

//search box

if ( searc == nam1 ) {

    alert("The phone Number is , " + num1);

}

if ( searc == num1 ) {

    alert("The Contact Name is , " + nam1);

}

注意：您应该

全局定义这些变量

，以便在需要时可以使用这些变量 使用。

尝试以下操作：

var nam1='';
var num1='';
var searc='';

function contact() {
    nam1=prompt("Please enter the name");
    num1=prompt("please enter the phone number");
}
contact();
function search() {
    searc= prompt("Please enter the name of your contact or phone number");
}
search();
//search box
if ( searc == nam1 ) {
    alert("The phone Number is , " + num1);
}
if ( searc == num1 ) {
    alert("The Contact Name is , " + nam1);
}

var nam1;
var num1;
var searc;

function contact() {

    nam1 = prompt("Please enter the name");
    num1 = prompt("please enter the phone number");

}

contact();

function search() {

    searc = prompt("Please enter the name of your contact or phone number");

}

search();

//search box

if ( searc == nam1 ) {

    alert("The phone Number is , " + num1);

}

if ( searc == num1 ) {

    alert("The Contact Name is , " + nam1);

}

注意：您应该

全局定义这些变量

，以便在需要时可以使用这些变量

---

使用。

这里的问题是变量的作用域

试试这个：

var nam1='';
var num1='';
var searc='';

function contact() {
    nam1=prompt("Please enter the name");
    num1=prompt("please enter the phone number");
}
contact();
function search() {
    searc= prompt("Please enter the name of your contact or phone number");
}
search();
//search box
if ( searc == nam1 ) {
    alert("The phone Number is , " + num1);
}
if ( searc == num1 ) {
    alert("The Contact Name is , " + nam1);
}

var nam1;
var num1;
var searc;

function contact() {

    nam1 = prompt("Please enter the name");
    num1 = prompt("please enter the phone number");

}

contact();

function search() {

    searc = prompt("Please enter the name of your contact or phone number");

}

search();

//search box

if ( searc == nam1 ) {

    alert("The phone Number is , " + num1);

}

if ( searc == num1 ) {

    alert("The Contact Name is , " + nam1);

}

---

这里的问题是变量的作用域

试试这个：

var nam1='';
var num1='';
var searc='';

function contact() {
    nam1=prompt("Please enter the name");
    num1=prompt("please enter the phone number");
}
contact();
function search() {
    searc= prompt("Please enter the name of your contact or phone number");
}
search();
//search box
if ( searc == nam1 ) {
    alert("The phone Number is , " + num1);
}
if ( searc == num1 ) {
    alert("The Contact Name is , " + nam1);
}

var nam1;
var num1;
var searc;

function contact() {

    nam1 = prompt("Please enter the name");
    num1 = prompt("please enter the phone number");

}

contact();

function search() {

    searc = prompt("Please enter the name of your contact or phone number");

}

search();

//search box

if ( searc == nam1 ) {

    alert("The phone Number is , " + num1);

}

if ( searc == num1 ) {

    alert("The Contact Name is , " + nam1);

}

---

在JavaScript中，变量仅是声明它们的函数的全局变量或局部变量。由于您在函数中声明了

nam1

、

num1

和

searc

，因此它们在外部不可用

---

请查看您的错误控制台。通常，至少在严格模式下，您应该得到一个

引用错误。为了防止出现这种情况，请在脚本开始时声明变量，不要在函数中重新声明它们。
在JavaScript中，变量仅是声明它们的函数的全局变量或局部变量。由于您在函数中声明了
nam1
、
num1
和
searc
，因此它们在外部不可用

请查看您的错误控制台。通常，至少在严格模式下，您应该得到一个
引用错误。为了防止出现这种情况，请在脚本开始时声明变量，不要在函数中重新声明它们。
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