javascript一些不错的函数脚本代码

计算字符长度的js函数
复制代码 代码如下:
function LEN(str){
var i,sum=0;
for(i=0;iif((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
复制代码 代码如下:
function TRIM(value){return value.replace(/^s*/,'').replace(/s*$/,''); }

图片自适应大小函数代码
复制代码 代码如下:
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("","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//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(/|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(10000alert(s+"超过5000字数限制 !");
o.focus();
return false;
}
return true;
}