html offsetwidth 字符串宽度,js中，如何计算一个字符串宽度

http://bbs.youkuaiyun.com/topics/300032210

function textSize(fontSize, text) {

var span = document.createElement("span");

var result = {};

result.width = span.offsetWidth;

result.height = span.offsetWidth;

span.style.visibility = "hidden";

document.body.appendChild(span);

if (typeof span.textContent != "undefined")

span.textContent = text;

else span.innerText = text;

result.width = span.offsetWidth - result.width;

result.height = span.offsetHeight - result.height;

span.parentNode.removeChild(span);

return result;

}

var size = textSize("9px", "囧");

alert("宽：" + size.width + " 高：" + size.height);

http://bbs.youkuaiyun.com/topics/390496387

.content{font-size:20px}

#dvCompute{position:absolute;visibility:hidden;}

function Compute(v) {

var d = document.getElementById('dvCompute');

d.innerHTML = v;

return { w: d.offsetWidth, h: d.offsetHeight };

}

window.onload = function () {

var p = Compute('要计算的内容aaaaaaaaaaaaaaaaaaaaaaaaaaaa
123132');

alert(p.w + '\n' + p.h);

var p = Compute('要计算的内容aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
123132
123132');

alert(p.w + '\n' + p.h);

}