<span style="font-family: "Microsoft Yahei", "Hiragino Sans GB", Helvetica, "Helvetica Neue", ???è?ˉé?…é?‘, Tahoma, Arial, sans-serif;">簡單封裝一個對象案例</span><br/>

String.prototype.isEmail = function(){<br/><br/> email = this; if (email.indexOf("@")!=-1&&email.indexOf(".")!=-1){ if(email .indexOf("@")

<br/>

? alert("The email address is illegal");
? }else{
? alert("The email address is legal");
? }
}
} var email = "jhhhhhh@gmail.com";
email.isEmail();

Added:

　The indexOf() method can return the position where a specified string value first appears in the string. If the string value to be retrieved does not appear, the method returns -1.

　The lastIndexOf() method can return the last occurrence position of a specified string value, searching from back to front at the specified position in a string. If the string value to be retrieved does not appear, the method returns -1.