jquery插件--多行文本缩略

text-overflow:ellipsis;
display:-webkit-box;
-webkit-line-clamp:3;
-webkit-box-orient:vertical;

/**
* 多行缩略
* @author rubekid
* {
*    maxLine:2, //最多显示行默认为1
*    ellipsisChar:"..." //省略占位符，建议不设置，与原生一致
* }
*/
(function ($) {

var supportLineClamp = function(){
var div = document.createElement('div');
var style = computeStyle(div);
return style!=null && "-webkit-line-clamp" in style;
}();

function computeStyle(el){
if(window.getComputedStyle){

return window.getComputedStyle(el,null);
}
return el.currentStyle;
}

/**
* 设置样式
* @param Element el
* @param JSON css
*/
function setStyle(el, css){
for(var i in css){
el.style[i] = css[i];
}
}

function ellipsis($elem, options) {
var maxLine = options.maxLine ||1;
var lineHeight = parseFloat($elem.css("line-height"));
var maxHeight = maxLine * lineHeight;
var content = $elem.text();
var $temp_elem = $elem.clone(false)
.css({"visibility": "hidden","overflow":"visible", "height":"auto"})
.appendTo($elem.parent());
$temp_elem.text(content);
var height = $temp_elem.height();
if(height > maxHeight){
if(supportLineClamp){
setStyle($elem.get(0), {
"text-overflow":"ellipsis",
"display":"-webkit-box",
"-webkit-line-clamp":maxLine,
"-webkit-box-orient":"vertical",
"overflow":"hidden"
});

}
else{

var _width = $elem.width();
var ellipsis_char = options.ellipsisChar;
var lineCount = 0;
var texts = content.split("\n", maxLine);
var newTexts = [];
for(var i=0; i<texts.length; i++){
var text = texts[i];
$temp_elem.text(text);
height = $temp_elem.height();
var _lineCount = height / lineHeight;
if(lineCount + _lineCount >= maxLine){
text = text + ellipsis_char;
$temp_elem.text(text);
text = text.replace(' ','　'); //for fix white-space bug　
$temp_elem.css({"whiteSpace": "nowrap","width":"auto" });
var max = (maxLine - lineCount) * _width;
var width = $temp_elem.get(0).scrollWidth;
if(width > max){
var stop =  Math.floor(text.length * max / width); // for performance while content exceeding the limit substantially
var temp_str = text.substring(0,stop) + ellipsis_char;
width = $temp_elem.text(temp_str).get(0).scrollWidth;
if(width > max){
while (width > max && stop > 1) {
stop--;
temp_str = text.substring(0, stop) + ellipsis_char;
width = $temp_elem.text(temp_str).width();
}
}
else if(width < max){
while (width < max && stop < text.length) {
stop++;
temp_str = text.substring(0, stop) + ellipsis_char;
width = $temp_elem.text(temp_str).get(0).scrollWidth;
}
if(width > max){
temp_str = text.substring(0,stop -1)+ellipsis_char;
}
}

newTexts.push(temp_str.replace('　',' '));
}
else{
newTexts.push(text);
}
break;
}
newTexts.push(text);
lineCount +=_lineCount;

}
text = newTexts.join("\n");
$temp_elem.text(text).css(
{"whiteSpace": "","width": $elem.width() }
);
var lastIndex = text.length;
var _temp_str = text;
height = $temp_elem.height();
while(height > maxHeight){
_temp_str = text.substring(0, --lastIndex) + ellipsis_char;
$temp_elem.text(_temp_str);
height = $temp_elem.height();
}

$elem.text(_temp_str);
}
}
$temp_elem.remove();
}

var defaults = {
maxLine: 1,
ellipsisChar:'...'
};

$.fn.ellipsis = function (options) {
return this.each(function () {
var $elem = $(this);
var opts = $.extend({}, defaults, options);
ellipsis($elem, opts);
});
};

$.fn.ellipsis.options = defaults;
})(jQuery);