javascript一些不错的函数脚本代码

计算字符长度的js函数

function LEN(str){ 
var i,sum=0; 
for(i=0;i<str.length;i++){ 
if((str.charCodeAt(i)>=0) && (str.charCodeAt(i)<=255)) 
sum=sum+1; 
else 
sum=sum+2; 
} 
return sum; 
}

去字符中前后的空格的js函数

function TRIM(value){return value.replace(/^\s*/,'').replace(/\s*$/,''); }

图片自适应大小函数代码

function imgAutoFit(imgObj,maxWidth,maxHeight){ 
    var heightWidth; 
    var widthHeight; 
    heightWidth = imgObj.offsetHeight/imgObj.offsetWidth; 
    widthHeight = imgObj.offsetWidth/imgObj.offsetHeight; 
    if(imgObj.offsetWidth>maxWidth){ 
        imgObj.width = maxWidth; 
        imgObj.height = maxWidth*heightWidth; 
    } 
    if(imgObj.offsetHeight>maxHeight){ 
        imgObj.height = maxHeight; 
        imgObj.width = maxHeight*widthHeight; 
    } 
}

function checkTagIsHave(s,t){
    var re=new RegExp("<\\/?"+t+"(?:(?:\\s|\\/)(?:\\n|.)*?)?>","ig");
    var r=re.test(s);
    re=null;
    return r;
}

function imgUploadFit(){
    var u = document.getElementsByName("imgUploadName");
    if(0==u.length) return;
    for(var i=0;i<u.length;i++){
        //imgAutoFit(u[i],560,560);
        imgAutoFit(u[i],320,320);
        u[i].onclick = function(){window.open(this.src);}
        u[i].style.cursor = "pointer";
        u[i].title = "点击看原图";
    }
}

function inputContent(theQ,oldContent,re,p){
    var o,oA=["msgframeamend","pingJiaFrame","touSuFrame"];
    for(o in oA){
        if($(oA[o])){
            theQ.editIframe(oA[o]);
            if("msgframeamend"==oA[o]) setTimeout(function(){$(oA[o]).contentWindow.document.body.innerHTML = oldContent.replace(re,"")+p[1];},100);
            return;
        }
    }
}

function checkCommon(n,v,t){
    var s = t?"补充提问":"回复内容";
    var o=document.getElementById(n).contentWindow;
    if("msgframereply" == n){
        if(v == ""){
            alert("请填写"+s+" !");
            o.focus();
            return false;
        }
    }
    if(""==v.replace(/<\/*?(?:img|p|pre|br)(?:(?:\s|\/)(?:\n|.)*?)?>|\s| /ig,"")&&checkTagIsHave(v,"img")){
        alert("针对图片，请附上一些说明性的文字！");
        o.focus();
        return false;
    }
    if(10000<LEN(v)){
        alert(s+"超过5000字数限制 !");
        o.focus();
        return false;
    }
    return true;
}