要使用HTML5 Canvas包装文本，我们可以创建一个自定义函数，该函数需要画布上下文，文本字符串，位置，最大宽度和行高。 该函数应使用canvas上下文的measureText（）方法来计算下一行应该换行的时间。
html代码：
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
function wrapText(context, text, x, y, maxWidth, lineHeight) {
var words = text.split(' ');
var line = '';
for(var n = 0; n < words.length; n++) {
var testLine = line + words[n] + ' ';
var metrics = context.measureText(testLine);
var testWidth = metrics.width;
if (testWidth > maxWidth && n > 0) {
context.fillText(line, x, y);
line = words[n] + ' ';
y += lineHeight;
}
else {
line = testLine;
}
}
context.fillText(line, x, y);
}
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var maxWidth = 400;
var lineHeight = 25;
var x = (canvas.width - maxWidth) / 2;
var y = 60;
var text = 'All the world \'s a stage, and all the men and'+
' women merely players. They have their exits and their'+
' entrances; And one man in his time plays many parts.';
context.font = '16pt Calibri';
context.fillStyle = '#333';
wrapText(context, text, x, y, maxWidth, lineHeight);
</script>
</body>
</html>
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