改写系统alert的弹出浮层的JS

发表于 2017-05-25 09:34:02 by 月小升

//改写alert  
window.alert = function(txt)  
{  
    var borderColor = "#999";
    var title = "[月小升博客提示]";
    var shield = document.createElement("DIV");  
    shield.id = "shield";  
    shield.style.position = "absolute";  
    shield.style.left = "0px";  
    shield.style.top = "0px";  
    shield.style.width = "100%";  
    shield.style.height = document.body.scrollHeight+"px";  
    shield.style.background = "#333";  
    shield.style.textAlign = "center";  
    shield.style.zIndex = "10000";  
    shield.style.filter = "alpha(opacity=0)";  
    var alertFram = document.createElement("DIV");  
    alertFram.id="alertFram";  
    alertFram.style.position = "absolute";  
    alertFram.style.left = "50%";  
    alertFram.style.top = "50%";  
    alertFram.style.marginLeft = "-225px";  
    alertFram.style.marginTop = "-75px";  
    alertFram.style.width = "450px";  
    alertFram.style.height = "150px";  
    alertFram.style.background = "#ccc";  
    alertFram.style.textAlign = "center";  
    alertFram.style.lineHeight = "150px";  
    alertFram.style.zIndex = "10001";  
    strHtml = "
\n";  
    strHtml += " 
"+title+"
\n";  
    strHtml += " 
"+txt+"
\n";  
    strHtml += " 
\n";  
    strHtml += "
\n";  
    alertFram.innerHTML = strHtml;  
    document.body.appendChild(alertFram);  
    document.body.appendChild(shield);  
    var c = 0;  
    this.doAlpha = function(){  
        if (c++ > 20){clearInterval(ad);return 0;}  
        shield.style.filter = "alpha(opacity="+c+");";  
    }  
    var ad = setInterval("doAlpha()",5);  
    this.doOk = function(){  
        alertFram.style.display = "none";  
        shield.style.display = "none";  
    }  
    alertFram.focus();  
    document.body.onselectstart = function(){return false;};  
}  

调用页面改写系统的alert

  

  
        
姓名：  

  

  

效果

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首发地址：月小升博客 – https://java-er.com/blog/js-alert-change-system/
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