1. Warning box
Alert boxes are often used if you want to ensure that information is passed on to the user. When the alert box pops up, the user will need to click OK to continue
< script > //警告框window . alert ( "成功弹出警告框！" ) ; //window.alert()方法可以不带window前缀。 //alert("成功弹出警告框！") < / script >
2. Confirmation box
A Confirmation box is usually used if you want the user to authenticate or accept something. When the confirmation box pops up, the user will have to click “OK” or “Cancel” to proceed.
< script > //确认框//原理：如果用户单击“确定”，该框返回true。如果用户单击“取消”，该框返回false。 window . confirm ( "请选择确定
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