How to input data in javascript: 1. Use the prompt() method, which will pop up a dialog box that allows input values. It provides two buttons, OK and Cancel, and also provides the expected input value; 2. Use comfirm () method, pops up a confirmation message dialog box, and can get the true or false value.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
JavaScript input statement
JS provides two input methods prompt() and confirm(), let’s learn about them next;
1. prompt() method
Pops up a dialog box that allows you to enter a value, with two buttons to confirm and cancel, and allows you to set the default value
Syntax format:
prompt(msg,defaultText)
msg: the text information to be displayed;
defaultText: the default value of the input box;
Example:
<script>
function inBtn(){
var msg = prompt("请输入值","预期输入");
alert("你输入的值：" + msg);
}
</script>
<button οnclick="inBtn()">打开输入框</button>
2. confirm() method
pops up a confirmation message dialog box with two buttons: OK and Cancel. Click OK to return true, and click Cancel to return false.
A dialog box pops up, showing the edited content, with two buttons: OK and Cancel. Click OK to return true, click Cancel to return false;
Syntax format:
confirm(message); //message为想要显示的内容
Example:
<body>
<script>
function inBtn(){
var msg = confirm("你学过Javascript吗？");
if(msg){
alert("学过了，那还需要努力!");
var msg2 = confirm("我将提供一个教程给你，需要吗？");
if(msg2)
alert("w3cschool");
else
alert("那可真是太遗憾了");
}else{
alert("没学过，那就开始学吧！");
}
}
</script>
<button οnclick="inBtn()">打开输入框</button>
</body>The animation demonstration effect is as follows:
javascript advanced tutorial]
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